Unit 5, Lesson 11

How Did You Do That?

Grade 1

Warm-up

Decide if each statement is true or false.
Be prepared to explain your reasoning.

Activity 1

Mai and her classmates volunteer to clean up the local park.
They pick up 37 plastic bottles and 25 paper wrappers.
How many pieces of litter did they pick up all together?

Jada, Kiran, and Tyler find the value of .

Jada’s way:

Base ten drawing. 3 tens and 2 tens, circled, labeled 50. 12 ones. Made of 10 ones, circled and labeled. Below 2 ones, labeled.

Kiran’s way:

Base ten drawing. Top row, 3 tens, 10 ones, circled and labeled 10. Below, labeled 40. 2 ones, not circled. Below labeled 42. 2 tens. Below, 62.

Tyler’s way:

Activity 2

Find the value of .
Show your thinking using drawings, numbers, or words.

If you have time: Think about a math story this expression could represent.
Share your stories with a partner.

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