DOUBLING STRATEGY

Use doubling chains to multiply by 4, 8, and other even numbers in a flash.

L3L4

CS.N.2.6·Introducing multiplication as repeated addition(II)CS.N.3.4·Performing multiplication and division with natural numbers(III)

Section 1 / 3

MULTIPLY BY 2: JUST DOUBLE!

Multiplying by 2 is the same as doubling. To multiply by 4, double twice. To multiply by 8, double three times. Doubling chains give you three times tables for the price of one!

4 x 7

1Double 7 = 14 (that is 2 x 7)

2Double again: 14 x 2 = 28

3So 4 x 7 = 28

= 28

LEADER TIP

Connect doubling to the x2, x4, and x8 tables. If students can double, they can multiply by any power of 2.

BEFORE THIS LESSON, TRY

Times Tables Mastery

PRACTICE WITH THESE GAMES

Double & Halve

Multiplication Quiz

Math Sprint

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DOUBLING STRATEGY

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DOUBLING STRATEGY