Trick 3 works near 10 and 100. With a working base like 50 = 5 × 10 or 300 = 3 × 100, the same idea works near ANY round number — you just multiply the left part by 5 or 3.
✓ You passed this trick’s test.
The trick
Anurupyena — “proportionately”
Pick the working base (like 40 = 4 × 10 or 300 = 3 × 100) and write each number’s difference from it.
Cross-add as in trick 3, then multiply that left part by 4 (or 3, 5…).
Right part: multiply the differences — 1 digit for a × 10 base, 2 digits for a × 100 base (carry the extra).
Use it for: Both numbers near the same round number: 20, 30 … 90, 200, 300, 400, 500, 600.
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Trick 15 test
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
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🏗️ Base Builder badge when you pass — and a certificate when you finish all 10 tricks of
Part 2 · Advanced tricks. You can still take the test without signing in.
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