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.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find 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.
Take turns spinning and recording a digit in the hundreds, tens, or ones place. Continue until your numbers are complete.
Find 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.
How would you find the value of 700 - 599? Explain your reasoning.
600 - 478
505 - 417