Common Core: 1st Grade Math : Operations & Algebraic Thinking

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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Example Questions

Example Question #851 : Operations & Algebraic Thinking

Joe has  total math problems to complete for homework tonight. He wants to get  done before dinner. How many will he have left to do after dinner? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many homework problems Joe will have left after he does some of them, so he will have less than what he started with. 

We can start at  and count back .

Example Question #1411 : Common Core Math: Grade 1

Mr. Bell has  desks in his classroom. He only needs  desks, how many extra desks does he have? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many extra desks Mr. Bell has after the  he needs are used. 

We can start at  and count back .

Example Question #851 : Operations & Algebraic Thinking

Lisa had  birthday parties to go to this summer. She has already gone to  of them. How many parties does she have left to go to this summer? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Lisa has alreayd gone to some of the parties that she was invited to, so she has less parties left to go to than she started with this summer. 

We can start at  and count back .

Example Question #1413 : Common Core Math: Grade 1

Tim’s soccer team has  boys on the team.  of them did not come to practice. How many did come to practice? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because people did not show up for practice, so there will be less people at practice than if everyone had shown up. 

We can start at  and count back .

Example Question #1414 : Common Core Math: Grade 1

Tiffany bought  balloons. On the way to the car, blew away. How many does she have left? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Tiffany lost balloons so she will have less than what she started with. 

We can start at  and count back .

Example Question #455 : Adding And Subtracting Within 20

Spot has a box of treats with  bones left. The box started off with  treats. How many treats has Spot eaten from the box?  

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many of the total treats Spot has eaten. We take the total number of treats and then subtract the number of treats that are left in the box. .

Example Question #1421 : Common Core Math: Grade 1

The baseball team has  balls to practice with. There are  boys on the team. If they each take a ball, how many balls are left over? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many balls are left over after each boy takes one. We start with the number of balls and then subtract the number that was taken. .

Example Question #852 : Operations & Algebraic Thinking

Jenny has  games. She let her friend use  of them for her birthday part. How many does Jenny have left?

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many games Jenny has left after she gives some to her friend. We take the total number of games that Jenny has, and then we subtract the number that she gave to her friend. .

Example Question #853 : Operations & Algebraic Thinking

Sarah got  birthday gifts for her birthday. She’s opened  of them. How many does she have left to open? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many gifts she has left to open after she’s already opened some of her gifts. We take the total number of gifts she has, and then we subtract the number of gifts that she’s opened. .

Example Question #851 : Operations & Algebraic Thinking

Matt invited  of his friends to a cookout. of his friends did not come. How many of his friends did come to his cookout? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to find out how many of Matt’s invited friends were able to come to his party. We take the total number of people that were invited, and subtract the number of people that did not come. 

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