Grade 3 Unit 3
Lesson 12: Subtract Strategically
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 12: Subtract Strategically
CC BY 2021 Illustrative Mathematics®
Find the value of each expression mentally.
2 x 6
3 x 6
2 x 7
3 x 7
Use a strategy or algorithm of your choice to find the value of each difference.
Show your reasoning. Organize it so it can be followed by others.
451 - 329
382 - 190
924 - 285
Directions:
Decide with your partner whether you will try to make the greatest difference or smallest difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
Compare your values.
Write a comparison using >, <, or =.
Play again.
We will make the difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
My number my partner's number
We will make the difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
My number my partner's number
We will make the difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
My number my partner's number
We will make the difference.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find the difference.
My number my partner's number
How would you find the value of 700 - 599? Explain your reasoning.
600 - 478
505 - 417