## Reflection: Multiply and Divide by 10 - Section 1: Warm Up with a Journal Response

One thing I was surprised by is that some students still thought that using a division or subtraction equation with a related multiplication or addition problem was the Commutative Property.  It was a great conversation and took us a little longer, but with pictures and discussion we were able to better understand the property vs. fact families.

Commutative Property Vs. Fact Family
Commutative Property Vs. Fact Family

# Multiply and Divide by 10

Unit 10: Fluency to Automoticity
Lesson 4 of 5

## Big Idea: Counting by 10's is easy for students of this age. Knowing that base 10 can be used to help multiply and divide in the higher numbers by decomposing is critical. This lesson sets the base for future work.

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Standards:
Subject(s):
Math, multiplication rule, commutative property of multiplication, base 10, word problems, math journaling
55 minutes

### Michelle Marcus

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