Addition And Subtraction Properties - 1st Grade Math
Card 1 of 15
What is $9 + 1 + 6$ if you group $9 + 1$ first?
What is $9 + 1 + 6$ if you group $9 + 1$ first?
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$16$. First $9 + 1 = 10$, then $10 + 6 = 16$.
$16$. First $9 + 1 = 10$, then $10 + 6 = 16$.
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What is $7 + 3 + 5$ if you group $7 + 3$ first?
What is $7 + 3 + 5$ if you group $7 + 3$ first?
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$15$. First $7 + 3 = 10$, then $10 + 5 = 15$.
$15$. First $7 + 3 = 10$, then $10 + 5 = 15$.
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What is $4 + 8 + 2$ if you group $8 + 2$ to make $10$?
What is $4 + 8 + 2$ if you group $8 + 2$ to make $10$?
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$14$. Group $8 + 2 = 10$, then $4 + 10 = 14$.
$14$. Group $8 + 2 = 10$, then $4 + 10 = 14$.
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What is $10 - 6$ if you know $6 + 4 = 10$?
What is $10 - 6$ if you know $6 + 4 = 10$?
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$4$. Since $6 + 4 = 10$, then $10 - 6 = 4$.
$4$. Since $6 + 4 = 10$, then $10 - 6 = 4$.
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What is $7 + 8 + 3$ using $(7 + 3)$ to make $10$?
What is $7 + 8 + 3$ using $(7 + 3)$ to make $10$?
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$18$. Regroup as $(7 + 3) + 8 = 10 + 8 = 18$.
$18$. Regroup as $(7 + 3) + 8 = 10 + 8 = 18$.
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What is $3 + 9 + 7$ using $(3 + 7)$ to make $10$?
What is $3 + 9 + 7$ using $(3 + 7)$ to make $10$?
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$19$. Regroup as $(3 + 7) + 9 = 10 + 9 = 19$.
$19$. Regroup as $(3 + 7) + 9 = 10 + 9 = 19$.
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What is $9 + 5 + 1$ using $(9 + 1)$ to make $10$?
What is $9 + 5 + 1$ using $(9 + 1)$ to make $10$?
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$15$. Regroup as $(9 + 1) + 5 = 10 + 5 = 15$.
$15$. Regroup as $(9 + 1) + 5 = 10 + 5 = 15$.
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What is $8 + 2 + 6$ using $(8 + 2)$ to make $10$?
What is $8 + 2 + 6$ using $(8 + 2)$ to make $10$?
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$16$. Regroup as $(8 + 2) + 6 = 10 + 6 = 16$.
$16$. Regroup as $(8 + 2) + 6 = 10 + 6 = 16$.
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What is $4 + 6 + 7$ using $(4 + 6)$ to make $10$?
What is $4 + 6 + 7$ using $(4 + 6)$ to make $10$?
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$17$. Regroup as $(4 + 6) + 7 = 10 + 7 = 17$.
$17$. Regroup as $(4 + 6) + 7 = 10 + 7 = 17$.
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What is $5 + 9 + 1$ using $(9 + 1)$ to make $10$?
What is $5 + 9 + 1$ using $(9 + 1)$ to make $10$?
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$15$. Regroup as $5 + (9 + 1) = 5 + 10 = 15$.
$15$. Regroup as $5 + (9 + 1) = 5 + 10 = 15$.
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What property of addition says $a + b = b + a$ (you can switch addends)?
What property of addition says $a + b = b + a$ (you can switch addends)?
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Commutative property of addition. Order doesn't matter when adding numbers.
Commutative property of addition. Order doesn't matter when adding numbers.
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What is $2 + 7 + 3$ using $(7 + 3)$ to make $10$?
What is $2 + 7 + 3$ using $(7 + 3)$ to make $10$?
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$12$. Regroup as $2 + (7 + 3) = 2 + 10 = 12$.
$12$. Regroup as $2 + (7 + 3) = 2 + 10 = 12$.
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What is $3 + 8$ if you know $8 + 3 = 11$?
What is $3 + 8$ if you know $8 + 3 = 11$?
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$11$. Commutative property: order doesn't change the sum.
$11$. Commutative property: order doesn't change the sum.
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What property says $a + 0 = a$ (adding zero does not change the number)?
What property says $a + 0 = a$ (adding zero does not change the number)?
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Identity property of addition (zero property). Adding zero leaves any number unchanged.
Identity property of addition (zero property). Adding zero leaves any number unchanged.
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What property of addition says $(a + b) + c = a + (b + c)$ (you can regroup addends)?
What property of addition says $(a + b) + c = a + (b + c)$ (you can regroup addends)?
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Associative property of addition. Grouping doesn't matter when adding multiple numbers.
Associative property of addition. Grouping doesn't matter when adding multiple numbers.
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