Common Core: 1st Grade Math : Adding and Subtracting Within 20
Study concepts, example questions & explanations for Common Core: 1st Grade Math
All Common Core: 1st Grade Math Resources
Example Questions
Example Question #15 : Subtraction Within 20 To Solve Word Problems
Sarah got 
This is a subtraction problem because we want to know how many gifts Sarah has left to open after she's already opened some.
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Example Question #841 : Operations & Algebraic Thinking
Matt invited 
This is a subtraction problem because some of the friends that Matt invitied did not come, so the total number of people that did come has to be less than what he invited.
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Example Question #17 : Subtraction Within 20 To Solve Word Problems
Ms. Smith’s class has 
This is a subtraction problem because some of Mrs. Smith's students are out with the flu, so the number of students in class has to be less than the total number of students that she has.
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Example Question #451 : Adding And Subtracting Within 20
Joe has 
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.
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Example Question #851 : Operations & Algebraic Thinking
Mr. Bell has 
This is a subtraction problem because we want to know how many extra desks Mr. Bell has after the 
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Example Question #452 : Adding And Subtracting Within 20
Lisa had 
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.
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Example Question #1051 : Numbers And Operations
Tim’s soccer team has 
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.
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Example Question #454 : Adding And Subtracting Within 20
Tiffany bought 
This is a subtraction problem because Tiffany lost balloons so she will have less than what she started with.
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Example Question #455 : Adding And Subtracting Within 20
Spot has a box of treats with 
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 
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. 
All Common Core: 1st Grade Math Resources
