Unit 2, Lesson 18 -- Multiplying by 3

Lesson 18-- Multiplying by 3

Introduction

Hello Mathematicians! We learned that we can use what we know about doubling to find 3 groups.  Today, we will continue to practice multiplying by 3.

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Interactive

Directions:

• Use the red counters to create an array that shows 2 rows of 7.
• What multiplication equation can you write to represent the array?
• Add 1 row of 7 with yellow counters. 
• How can we write an equation to show that we started with 2 groups of 7 and added another group of 7?
• Now try making these arrays, and writing an equation:
  • 3 X 4 = 
  • 3 X 9 =
  • 3 X 3 =

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Assignment

• Draw the chart below in your math notebook.
• Create your own multiplication story that shows items that come in groups of 3. Draw a picture, write a story problem, and model
  the equation with a number line.

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Georgia Department of Education, Math