Doubles

Know every double without thinking.

How to do it

Method

Know every double without thinking

6 + 6 = 12, 7 + 7 = 14, 8 + 8 = 16

Another way

Make ten

7 + 7 = 7 + 3 + 4 = 10 + 4 = 14

In full

Doubles should be as automatic as your own phone number: 6+6=12, 7+7=14, 8+8=16, 9+9=18. Once they're free, they become the anchor for lots of other facts.

Worked examples

Have a go first, then open each one for the answer and the working.

Example 1
3 + 3
Show the answer and working
Answer: 3 + 3 = 6
double 3, 3 + 3 = 6
Example 2
12 + 12
Show the answer and working
Answer: 12 + 12 = 24
double 12, 12 + 12 = 24
Example 3
11 + 11
Show the answer and working
Answer: 11 + 11 = 22
double 11, 11 + 11 = 22
Example 4
10 + 10
Show the answer and working
Answer: 10 + 10 = 20
double 10, 10 + 10 = 20

Practise doubles in the game →Stage 1 · Number sense · Free to start, unlimited questions, no download