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Unit 5 - Lesson 11 - Grade 5: Illustrative Mathematics

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Grade 5 Unit 5
Lesson 11: Make Sense of Decimal Addition
CC BY 2021 Illustrative Mathematics
Grade 5 Unit 5
Lesson 11: Make Sense of Decimal Addition
CC BY 2021 Illustrative Mathematics
Lesson: Make Sense of Decimal Addition

How Many Do You See: Grids (Warm Up)

1.

How many do you see? How do you see them?




The Sum

2.

Find the value of the expression. Show your thinking. Organize it so it can be followed by others.

3.

What questions do you have about adding decimals?


Target Numbers: Add Tenths or Hundredths

Play one round of Target Numbers.

Partner A
  • Start at 0. Roll the number cube. Choose whether to add that number of tenths or hundredths to your starting number.
  • Write an equation to represent the sum.

  • Take turns until you’ve played 6 rounds.
  • Each round, the sum from the previous equations becomes the starting number in the new equation.
  • The partner to get a sum closest to 1 without going over wins.
4.

Describe a move that you could have made differently to change the outcome of the game.

Cool Down: The Value of the Sum
5.

What is the value of 1.20 + 0.13? Explain or show your reasoning.