Mental division
Division feels hard only when you attack it head-on. The mental approach converts division into doubling or quadrupling — operations your brain already owns.
Three conversions cover the cases that actually come up: ÷5, ÷25, and the halving chains ÷4 and ÷8.
Method 1 · Level 1
How to Divide by 5 in Your Head
To divide by 5, double the number and divide by 10: 340 ÷ 5 → 680 ÷ 10 = 68.
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Method 2 · Level 2How to Divide by 25 in Your Head
To divide by 25, multiply by 4 and divide by 100: 1,600 ÷ 25 → 6,400 ÷ 100 = 64.
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Method 3 · Level 1Halving Chains: Divide by 4 and by 8
Divide by 4 = halve twice. Divide by 8 = halve three times: 376 ÷ 8 → 188 → 94 → 47.
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