Adding within 20

For grown-ups: this lesson in words

Years 1 and 2 · Maths

Adding within 20: I can add numbers up to 20.

1. 6 apples and 6 more apples.

   Both groups are the same. That is a double.

   6 + 6 = 12. Double 6 is 12.

   Picture: Two groups of apples: 6 and 6. The groups are pushed together and counted. 12 apples altogether.

2. 6 apples and 7 apples.

   6 + 6 = 12, and 7 is 1 more than 6.

   So 6 + 7 = 13. A near double!

   Picture: Two groups of apples: 6 and 7. The groups are pushed together and counted. 13 apples altogether.

3. Your turn: 7 ducks and 7 more ducks. What is double 7?

   Picture: Two groups of ducks: 7 and 7.

   Choose one:

   • 13
   • 14
   • 15

   Answer

   The answer: 14

   7 + 7 = 14. Double 7 is 14.

   Picture: Two groups of ducks: 7 and 7. The groups are pushed together and counted. 14 ducks altogether.

Words to know

double:

The same number added twice, like 6 + 6.

near double:

Two numbers next to each other, like 6 + 7.

ten frame:

A box with 10 spaces, in 2 rows of 5.

count on:

Start at a number and keep counting up.