Unit 3, Lesson 12- Multiplying by 10

Lesson 12-- Multiplying by 10

Introduction

Hello Mathematicians! Today we will look at multiplying by multiples of ten. 

Take a look at the following table:

Multiplication Expression	Expression (Unit Form)	Product (Unit Form)	Product (Standard Form)
4 X 10	4 X 1 ten	4 tens	40
4 X 20	4 X 2 tens	8 tens	80
4 X 30	4 X 3 tens	12 tens	120
4 X 40	4 X 4 tens	16 tens
4 X 50	4 X 5 tens
4 X 60
4 X 70
4 X 80

In your math notebook, complete the table.  Use the base ten blocks below to help you.

Then, answer the following questions:

• What patterns do you notice?
• What do you wonder?
• How did you find the product in standard form?
• What do you think the product of 8 X 40 would be?  Explain.
• What strategy did you use to calculate 8 X 40?

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 Video

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Interactive

Directions:

• In the interactive below, find the products.
• Draw models in your notebook, or use base ten blocks to help you.

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Georgia Department of Education, Math