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Grade 1 · Maths · Lessons
Within twenty
🔟make ten➕add➖take away👯doubles
Facts to twenty.
The big ideaMake a ten, get back to ten, and know your doubles.

How it works

Make a ten to help: 8 + 5 is 8 + 2 more to ten, then 3 more.

To take away, get back to ten first.

Know your doubles: 6 + 6 = 12.

456789101112131415-4-4startend
14 − 8: back to ten, then back 4 more.

Example 1: Make a ten

  1. ? = 3 + 7
  2. 3 and 7 are partners that make 10.
  3. Use pairs that make ten.
  4. So the answer is 10.

Example 2: Take away from fourteen

  1. 14 − 8 = ?
  2. Go back to ten first: 14 − 4 = 10.
  3. Then take away the rest: 10 − 4 = 6.
  4. So the answer is 6.

Example 3: From ten

  1. 10 − 4 = ?
  2. 10 take away 4.
  3. 10 is made of 6 and 4.
  4. So the answer is 6.

Words to know

partners
Two numbers that make a total together.
doubles
Two of the same number, like 6 + 6.

Watch out

Try it

  1. ? = 18 − 9
  2. 4 − 1 = ?
  3. 7 − 7 = ?
Answers: 1. 9 · 2. 3 · 3. 0
For grown-upsPractise ten partners (1 and 9, 2 and 8, 3 and 7) on your fingers until they are fast.
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