Maths worksheets · lesson 3 of 64 · free

Addition up to 20 — Maths worksheet

Adding means putting together. The quick way is to start from the bigger number and count on the smaller number on your fingers. 8 + 7: start at 8 and count on seven more — 9, 10, 11, 12, 13, 14, 15.

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The method

Count on — “keep the bigger number in your head and count on the smaller one”

  1. Start with the bigger number.
  2. Count on the smaller number, one finger at a time.
  3. For a missing number (8 + ? = 15), count on from 8 up to 15, or take away: 15 − 8.

Use it for: Adding toys, sweets or runs in a game, and the addition chapter of Class 1 maths.

Worked example: 8 + 7 = 15

  1. Start at 8 and count on 7: 9, 10, 11, 12, 13, 14, 15.
  2. 8 + 7 = 15.

Check: 7 + 8 is also 15 — the order does not change the answer ✓

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✏️ Practice

Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.

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🏁 Lesson 3 test

20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the ➕ Count-On Cub badge when you pass — and a certificate when you finish all 8 lessons of Part 1 · Class 1. You can still take the test without signing in.

🖨️ Class 1 Maths Worksheet: Addition

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