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Use Double and Double Again To Solve Multiplications

In this worksheet, students will multiply numbers by 4 by doubling and doubling again.

Worksheet Overview

In this activity, we will learn to use a quick number trick to multiply numbers by four.


Learning the four times table is important, but sometimes mental calculations can be useful to find multiplication facts too. 

So, we will be using the skill of doubling to help to find the answers to questions where we need to multiply by four. 

Let's look at an example.


Here are five candles.


lit candles


If we double this number, we get 2 × 5 = 10 candles


lit candles        lit candles


If we double this number again, we get 2 × 10 = 20 candles


candles        candles                   candles       candles


This is 4 lots of the original 5 candles so 4 × 5 = 20


So, to multiply a number by 4, we double it and double the answer again. 


Let's try an example.



Find 4 × 5 by using this table to first find A and then B.


Double 5  is 
Then 4 × 5  is 



Double 5 is 10, so A is 10.

Double 10 is 20, so B is 20.

So 4 × 5 is 20.


Now, we've looked at the method, you are ready to try some questions in the same style.


girl thinking

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