Unit 3 Multiplication And Division Worksheet Page 4
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S h o w
S h a r e
Show your arrays and multiplication facts to another pair of students.
What do you notice when you double the size of an array?
In a multiplication fact, you multiply factors to get a product.
4
5
20
When you double a
factor
factor
product
number, you are
multiplying by 2.
Doubling is a strategy you can use to multiply.
Here are three ways you can use doubling to multiply.
➤ Use doubling to multiply by 4.
To find 4
9:
First find 2
9, then double.
2
9
18
18
18
36
2
9
18
4
9
36
➤ Use repeated doubling to multiply by 8.
To find 8
8:
First think of 2
8
16, then double, and then double again.
2
8 is 8
8
16
So, 2
8
16
4
8 is double 2
8
16
16
32
So, 4
8
32
8
8 is double 4
8
32
32
64
So, 8
8
64
83
Unit 3 Lesson 1
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