Grade 1 · Unit 1: Number and place value

Doubles and near doubles

Two the same makes a double.

Doubles everywhere

A butterfly has two wings that match. If one wing has 3 spots and the other has 3 spots, that is 3 + 3 = 6. Adding two numbers that are the same is a double.

Doubles to 10

Double 1 is 2. Double 2 is 4. Double 5 is 10 – like two hands of fingers. Doubles are always even numbers!

Near doubles

6 + 7 is nearly a double. Double 6 is 12. Add one more: 13. This is a near double trick.

Doubling bigger numbers

We can double tens and fives too. Double 10 is 20. Double 15 is 30. Double 25 is 50. Doubling is the opposite of finding half.

What I learnt

• I know doubles to double 10.
• I can use a double to work out a near double.
• I can double 5, 10, 15, 20 and 25.