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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.
✓ You passed this lesson’s test.
Double and adjust — “double the smaller number, then add the difference”
Use it for: Any two numbers that are 1 or 2 apart: 7 + 8, 25 + 26, 24 + 22.
Check: 16 + 17 = 10 + 10 + 6 + 7 = 20 + 13 = 33 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
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.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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