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K-5 Grade 4 Unit 6 Lesson 10

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Lesson 10

Warm-up Activity 1 Activity 2

Unit 6, Lesson 10

Using Algorithms with Partial Products: 2 Two-Digit Numbers

Grade 4

Warm-up

What do you notice? What do you wonder?

Activity 1

Tyler uses an algorithm to find the value of .

Describe each step in Tyler’s method. How do you think he arrived at the last five numbers? Record your thinking.
Use Tyler’s method to find the value of . Then draw a diagram to check your answer.

Activity 2

Decide with your partner who will find each product. Show your thinking. Organize it so it can be followed by others.
Here is Han’s computation of .
1. What error or errors did Han make?
2. Show the correct computation for finding the value of .