This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves addition because it asks how much sugar is used in all, with fractions 1/4 and 2/4 both referring to the same measuring cup size and having the same denominator (4), so we add 1+2=3, giving 3/4 cup. Choice A is correct because the context indicates addition, so 1/4 + 2/4 = 3/4 cup, and the answer includes proper units cup. Choice B represents an arithmetic error or halving (perhaps 1/4 + 2/4 as 3/8), which happens when students change the denominator incorrectly. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 1/4 + 2/4 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (5/8 of the pizza, 3/5 mile). Use visual models: draw rectangle divided into eighths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves addition because it asks what fraction of the pitcher she poured in all, with the two fractions 1/6 and 2/6 both referring to the same pitcher and having the same denominator (6), so we add 1+2=3, giving 3/6 of the pitcher. Choice A is correct because the context indicates addition, so 1/6 + 2/6 = 3/6, and the answer includes proper units of the pitcher; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice B represents subtracted denominators incorrectly, which happens when students think denominators change. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 1/6 + 2/6 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (3/6 of the pitcher, 3/5 mile). Use visual models: draw rectangle divided into sixths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves addition because it asks for the fraction that are animals or sports altogether, with fractions 2/8 and 5/8 both referring to the same whole page and having the same denominator (8), so we add 2+5=7, giving 7/8 of the stickers. Choice A is correct because the context indicates addition, so 2/8 + 5/8 = 7/8 of the stickers, and the answer includes proper units of the stickers. Choice B represents subtracting instead of adding (5/8 - 2/8 = 3/8), which happens when students misidentify the operation from context. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 2/8 + 5/8 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (5/8 of the pizza, 3/5 mile). Use visual models: draw rectangle divided into eighths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves addition because it asks for the fraction they ate altogether, with fractions 2/8 and 3/8 both referring to the same pizza and having the same denominator (8), so we add 2+3=5, giving 5/8 of the pizza. Choice B is correct because the context indicates addition, so 2/8 + 3/8 = 5/8 of the pizza, and the answer includes proper units of the pizza. Choice C represents adding the numerators and denominators incorrectly (2/8 + 3/8 as 5/16 or perhaps 2+3/8=7/8), which happens when students make calculation errors or misinterpret the operation. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 2/8 + 3/8 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (5/8 of the pizza, 3/5 mile). Use visual models: draw rectangle divided into eighths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves subtraction because it asks what fraction of the cake Carlos has left, with the two fractions 6/8 and 1/8 both referring to the same cake and having the same denominator (8), so we subtract 6-1=5, giving 5/8 of the cake. Choice B is correct because the context indicates subtraction, so 6/8 - 1/8 = 5/8, and the answer includes proper units of the cake; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice C represents selecting a given fraction without computing, which happens when students don't complete the operation. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 6/8 - 1/8 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (5/8 of the cake, 3/5 mile). Use visual models: draw rectangle divided into eighths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves subtraction because it asks how much water is left in the container, with the two fractions 5/12 and 2/12 both referring to the same container and having the same denominator (12), so we subtract 5-2=3, giving 3/12 of the container. Choice B is correct because the context indicates subtraction, so 5/12 - 2/12 = 3/12, and the answer includes proper units of the container; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice A represents the wrong operation (added when should subtract), which happens when students misinterpret keywords. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 5/12 - 2/12 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (3/12 of the container, 3/5 mile). Use visual models: draw rectangle divided into twelfths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves subtraction because it asks what fraction of the pie is left, with the two fractions $\tfrac{7}{10}$ and $\tfrac{3}{10}$ both referring to the same pie and having the same denominator (10), so we subtract $7-3=4$, giving $\tfrac{4}{10}$ of the pie. Choice A is correct because the context indicates subtraction, so $\tfrac{7}{10} - \tfrac{3}{10} = \tfrac{4}{10}$, and the answer includes proper units of the pie; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice C represents an arithmetic error, which happens when students make calculation errors in numerators. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: $\tfrac{7}{10} - \tfrac{3}{10} = ?$. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer ($\tfrac{4}{10}$ of the pie, $\tfrac{3}{5}$ mile). Use visual models: draw rectangle divided into tenths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves subtraction because it asks what fraction of a mile Amir has left to walk, with the two fractions 9/12 and 4/12 both referring to the same path and having the same denominator (12), so we subtract 9-4=5, giving 5/12 mile. Choice B is correct because the context indicates subtraction, so 9/12 - 4/12 = 5/12, and the answer includes proper units mile; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice A represents the wrong operation (added when should subtract), which happens when students misinterpret keywords. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 9/12 - 4/12 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (5/12 mile, 3/5 mile). Use visual models: draw rectangle divided into twelfths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves addition because it asks what fraction of the roll she used in all, with the two fractions 2/10 and 5/10 both referring to the same roll and having the same denominator (10), so we add 2+5=7, giving 7/10 of the roll. Choice C is correct because the context indicates addition, so 2/10 + 5/10 = 7/10, and the answer includes proper units of the roll; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice B represents selecting a given fraction without computing, which happens when students don't complete the operation. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 2/10 + 5/10 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (7/10 of the roll, 3/5 mile). Use visual models: draw rectangle divided into tenths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.

This question tests 4th grade ability to solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, using visual models and equations to represent the problem (CCSS.4.NF.3.d). Word problems with fractions require identifying whether to add (combine, total, altogether) or subtract (left, remaining, how much more). The fractions must refer to the SAME WHOLE (same pizza, same distance, same container—not different-sized objects) and have the SAME DENOMINATOR (all eighths, all fifths, etc.). Once the operation is identified, we add or subtract the numerators and keep the denominator the same, then include appropriate units in the answer. This problem involves subtraction because it asks how much farther Sofia walked than Amir, with the two fractions 4/5 and 2/5 both referring to the same trail and having the same denominator (5), so we subtract 4-2=2, giving 2/5 mile. Choice C is correct because the context indicates subtraction, so 4/5 - 2/5 = 2/5, and the answer includes proper units mile; this demonstrates understanding of how to interpret word problem context and perform fraction operations. Choice A represents an arithmetic error, which happens when students make calculation errors in numerators. To help students: Identify keywords for operation (total, altogether, in all → addition; left, remaining, how much more → subtraction). Check SAME WHOLE explicitly—problem must state 'same pizza,' 'same distance,' 'same container.' Verify LIKE DENOMINATORS—all fractions must have same denominator. Write equation representing problem: 4/5 - 2/5 = ?. Solve: add or subtract numerators, keep denominator same. ALWAYS include units in answer (2/5 mile, 3/5 mile). Use visual models: draw rectangle divided into fifths (or appropriate denominator), shade amounts, show combining or removing. Check reasonableness: for addition, answer should be larger than either addend; for subtraction, answer should be smaller than minuend. Watch for: wrong operation choice, changing denominators, forgetting units, arithmetic errors in numerators, and not recognizing same whole requirement.