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If you double one number and halve the other, the answer does not change. Use it to turn a number ending in 5 into a round number.
✓ You passed this lesson’s test.
Double and halve — “double one number, halve the other — the answer stays the same”
Use it for: Any number ending in 5 times an even number: 35 × 16, 45 × 12, 125 × 8.
Check: 25 × 28 = 25 × 4 × 7 = 100 × 7 = 700 ✓
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 ⚡ Doubling Dynamo badge when you pass — and a certificate when you finish all 9 lessons of Module 3 · Multiplication strategies. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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