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Squaring is multiplying a number by itself, so the crosswise method gets even simpler: left a², middle 2ab, right b².
✓ You passed this trick’s test.
Dwandwa Yoga — “the duplex”
Use it for: Squaring any 2-digit number (use Level 2 for numbers ending in 5).
Check: 47² = 50² − 2×50×3 + 3² = 2500 − 300 + 9 = 2209 ✓
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 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🔷 Square Master badge when you pass — and a certificate when you finish all 10 tricks of Part 1 · Core tricks. 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.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.