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Unit 8 - Lesson 11 - Grade 5: Illustrative Mathematics

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Grade 5 Unit 8
Lesson 11: What’s the Difference?
CC BY 2021 Illustrative Mathematics®
Grade 5 Unit 8
Lesson 11: What’s the Difference?
CC BY 2021 Illustrative Mathematics®
Lesson: What’s the Difference?

Number Talk: Subtracting Fractions (Warm Up)

Find the value of each difference mentally.
1.

2.

3.

4.

Greatest Difference

Use the directions to play Greatest Difference with a partner.
  1. Spin the spinner.
  2. Each player writes the number that was spun in an empty box for Round 1. Be sure your partner cannot see your numbers.
  3. Once a number is written down, it cannot be changed.
  4. Continue spinning and writing numbers in the empty boxes until all 4 boxes have been filled.
  5. Find the difference.
  6. The person with the greatest difference wins the round.
  7. After all 4 rounds, the player who won the most rounds, wins the game.
  8. If there is a tie, players add the differences from all 4 rounds and the highest total wins the game.

Round 1

5.

Complete Steps 1-5.

The person with the greater difference wins the round.

Round 2

6.

Complete Steps 1-5.

The person with the greater difference wins the round.

Round 3

7.

Complete Steps 1-5.

The person with the greater difference wins the round.

Round 4

8.

Complete Steps 1-5.

The person with the greater difference wins the round.

  • After all 4 rounds, the player who won the most rounds wins the game.
  • If there is a tie, players add the sums from all 4 rounds and the highest total wins the game.

What is the Smallest Difference?

9.

Use the numbers below to fill in the squares. Find each difference. Add the 2 differences together.

Cool Down: Reflect on Subtracting Fractions
10.

What is important to remember when subtracting fractions with unlike denominators?