Common Core: 1st Grade Math : Subtraction within 20 to Solve Word Problems

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

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Example Questions

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Example Question #31 : Subtraction Within 20 To Solve Word Problems

Mr. Bell has  desks in his classroom, but he only needs  desks because he has  students. How many extra desks does he have? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because we want to know how many desks are left over after all of Mr. Bell’s class sits at a desk. We take the number of desks in his room, and subtract the number of students that he has. 

Example Question #32 : Subtraction Within 20 To Solve Word Problems

Tom went to school with  pieces of gum. He left school with  pieces. How many pieces did he chew at school? 

Possible Answers:

Correct answer:

Explanation:

This is a subtraction problem because Tim's total amount of gum decreased. 

We can start at  and count back .

Example Question #831 : Operations

 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 .

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