Grade 2 Unit 7
Lesson 3: Count on or Count Back to Subtract
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 3: Count on or Count Back to Subtract
CC BY 2021 Illustrative Mathematics®
Find the value of each expression mentally.
What do you notice?
What do you wonder?
Try Andre’s way to find the value of
189 - 73.
Show your thinking. Use a number line if it helps.
Find the value of 647 - 46 in your own way.
Show your thinking. Use a number line if it helps.
Oh no! Diego spilled paint on his paper and now he can’t see all the numbers.
Find the number that makes each equation true.
250 +
600 - 440 =
680 +
Find the number that makes the equation true.
Show your thinking.
900 - 370 =