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

Example Question #461 : Adding And Subtracting Within 20

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 #31 : 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 #1053 : Ssat Elementary Level Quantitative (Math)

 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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