Common Core: 2nd Grade Math : Use Addition and Subtraction Within 100 to Solve One- and Two-Step Word Problems: CCSS.Math.Content.2.OA.A.1

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

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Example Questions

Example Question #1 : Using Addition Within 100 To Solve Word Problems

Molly has \(\displaystyle 37\) pencils and Natalie has \(\displaystyle 24\). How many total pencils do they have if they put theirs together? 

Possible Answers:

\(\displaystyle 64\)

\(\displaystyle 65\)

\(\displaystyle 63\)

\(\displaystyle 61\)

\(\displaystyle 62\)

Correct answer:

\(\displaystyle 61\)

Explanation:

This is an addition problem because Molly and Natalie are putting their pencils together. We can either add \(\displaystyle 37+24=61\) or \(\displaystyle 24+37=61\)

Example Question #1 : Using Addition Within 100 To Solve Word Problems

Emily has \(\displaystyle 18\) blueberries, \(\displaystyle 14\) strawberries, and \(\displaystyle 30\) raspberries on her plate. How many total pieces of fruit does she have? 

Possible Answers:

\(\displaystyle 48\)

\(\displaystyle 64\)

\(\displaystyle 62\)

\(\displaystyle 44\)

\(\displaystyle 32\)

Correct answer:

\(\displaystyle 62\)

Explanation:

This is an addition problem because we want to know how many total pieces of fruit Emily has on her plate all together. We can add the numbers is any order, \(\displaystyle 18+14+30=62.\) 

Example Question #142 : How To Add

Lindsey’s family is going on vacation. She packs \(\displaystyle 20\) things, her dad packs \(\displaystyle 35\) things, and her mom packs \(\displaystyle 30\) things. How many total things are they taking on their vacation? 

Possible Answers:

\(\displaystyle 50\)

\(\displaystyle 55\)

\(\displaystyle 80\)

\(\displaystyle 65\)

\(\displaystyle 85\)

Correct answer:

\(\displaystyle 85\)

Explanation:

This is an addition problem because we want to know how many total things that Lindsey’s family is bringing on vacation all together. We can add the numbers in any order, \(\displaystyle 20+35+30=85.\) 

Example Question #4 : Use Addition And Subtraction Within 100 To Solve One And Two Step Word Problems: Ccss.Math.Content.2.Oa.A.1

Amy’s street has three houses on it. The first house has \(\displaystyle 14\) rooms, the second house has \(\displaystyle 17\) rooms, and the third house has \(\displaystyle 13\) rooms. How many total rooms do the \(\displaystyle 3\) houses have? 

Possible Answers:

\(\displaystyle 31\)

\(\displaystyle 30\)

\(\displaystyle 27\)

\(\displaystyle 44\)

\(\displaystyle 43\)

Correct answer:

\(\displaystyle 44\)

Explanation:

This is an addition problem because we want to know how many total rooms the houses have all together. We can add the numbers in any order, \(\displaystyle 14+17+13=41.\)

Example Question #2151 : Common Core Math: Grade 2

A bag of marbles has \(\displaystyle 20\) purple marbles, \(\displaystyle 33\) black marbles, and \(\displaystyle 26\) red marbles. How many marbles are in the bag? 

Possible Answers:

\(\displaystyle 43\)

\(\displaystyle 46\)

\(\displaystyle 79\)

\(\displaystyle 53\)

\(\displaystyle 59\)

Correct answer:

\(\displaystyle 79\)

Explanation:

This is an addition problem because we want to know how many total marbles are in the bag all together. We can add the numbers in any order, \(\displaystyle 20+33+26=79.\) 

Example Question #1 : Using Addition Within 100 To Solve Word Problems

At the dog park there are \(\displaystyle 15\) brown dogs, \(\displaystyle 13\) white dogs, and \(\displaystyle 11\) black dogs. How many dogs are at the park? 

Possible Answers:

\(\displaystyle 39\)

\(\displaystyle 26\)

\(\displaystyle 24\)

\(\displaystyle 38\)

\(\displaystyle 28\)

Correct answer:

\(\displaystyle 39\)

Explanation:

This is an addition problem because we want to know how many total dogs are at the park all together. We can add the numbers in any order, \(\displaystyle 15+13+11=39.\)

Example Question #1 : Use Addition And Subtraction Within 100 To Solve One And Two Step Word Problems: Ccss.Math.Content.2.Oa.A.1

At school we had a hotdog-eating contest. I ate \(\displaystyle 13\) hotdogs, Mel ate \(\displaystyle 12\) hotdogs, and Eric ate \(\displaystyle 15\) hotdogs. How many total hotdogs did we eat?

Possible Answers:

\(\displaystyle 40\)

\(\displaystyle 25\)

\(\displaystyle 38\)

\(\displaystyle 28\)

\(\displaystyle 27\)

Correct answer:

\(\displaystyle 40\)

Explanation:

This is an addition problem because we want to know how many total hotdogs were eaten all together. We can add the numbers up in any order, \(\displaystyle 13+12+15=40.\)

Example Question #2152 : Common Core Math: Grade 2

At the cakewalk there are \(\displaystyle 30\) chocolate cakes, \(\displaystyle 24\) yellow cakes, and \(\displaystyle 12\) white cakes. How many total cakes are there? 

Possible Answers:

\(\displaystyle 54\)

\(\displaystyle 72\)

\(\displaystyle 42\)

\(\displaystyle 36\)

\(\displaystyle 66\)

Correct answer:

\(\displaystyle 66\)

Explanation:

This is an addition problem because we want to know how many total cakes are at the cakewalk all together. We can add the numbers in any order, \(\displaystyle 30+24+12=66.\) 

Example Question #2153 : Common Core Math: Grade 2

At Linda’s birthday party there were \(\displaystyle 16\) peperoni pizzas, \(\displaystyle 13\) sausage pizzas, and \(\displaystyle 17\) cheese pizzas. How many total pizzas were there? 

Possible Answers:

\(\displaystyle 33\)

\(\displaystyle 29\)

\(\displaystyle 48\)

\(\displaystyle 30\)

\(\displaystyle 46\)

Correct answer:

\(\displaystyle 46\)

Explanation:

This is an addition problem because we want to know how many total pizzas they have. We can add the numbers in any order, \(\displaystyle 16+13+17=46.\) 

Example Question #1 : Use Addition And Subtraction Within 100 To Solve One And Two Step Word Problems: Ccss.Math.Content.2.Oa.A.1

There are two after-school programs at Steve’s school. One program has \(\displaystyle 39\) students and the other program has \(\displaystyle 46\). How many total students go to the after-school programs? 

Possible Answers:

\(\displaystyle 86\)

\(\displaystyle 84\)

\(\displaystyle 87\)

\(\displaystyle 83\)

\(\displaystyle 85\)

Correct answer:

\(\displaystyle 85\)

Explanation:

This is an addition problem because we want to know how many total students are in the after-school programs altogether. We can either add \(\displaystyle 39+46=85\) or \(\displaystyle 46+39=85.\) 

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