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Mathematics · Grades 1–2

Addition within twenty

Make ten first when it helps.

Make a worksheet

The key idea

Make ten first when it helps.

a + b = total

Worked examples

12 + 1 = ?

12 + 1 = 13

13

6 + 6 = ?

6 + 6 = 12

12

Try it yourself

  1. 4 + 7 = ?

  2. 18 + 1 = ?

Check your understanding

Answers and marking notes
  1. 11

    4 + 7 = 11

  2. 19

    18 + 1 = 19

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.