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Mental maths · lesson 3 of 28 · free

Near doubles — Mental Maths Mastery

Doubles are easy to remember: 6 + 6 = 12, 15 + 15 = 30. When two numbers are nearly the same, use the double and add the little bit extra.

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How to do it in your head

Double and adjust — “double the smaller number, then add the difference”

  1. Find the smaller number and how much bigger the other one is.
  2. Double the smaller number.
  3. Add the difference.

Use it for: Any two numbers that are 1 or 2 apart: 7 + 8, 25 + 26, 24 + 22.

Worked example: 16 + 17 = 33

  1. 17 is 16 + 1, so this is double 16 and 1 more.
  2. Double 16 = 32.
  3. 32 + 1 = 33.

Check: 16 + 17 = 10 + 10 + 6 + 7 = 20 + 13 = 33 ✓

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✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ Practice

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

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🏁 Lesson 3 test

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

🏅 Sign in with Google to earn the 🎲 Double Dice badge when you pass — and a certificate when you finish all 7 lessons of Part 1 · Mental addition & subtraction. You can still take the test without signing in.

🖨️ Near Doubles Addition Worksheet

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