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To square a number, move it up to the nearest round number and move it down by the same amount. Multiplying those two is easy because one of them ends in 0 — then just add the square of how far you moved.
✓ You passed this lesson’s test.
Up and down — “go the same distance up and down to a round number, multiply, then add the distance squared”
Use it for: Squares for Class 7–9, area of a square, and quick checks of square roots.
Check: 73 × 73 = 73 × 70 + 73 × 3 = 5110 + 219 = 5329 ✓
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 🎢 Up-Down Squarer badge when you pass — and a certificate when you finish all 9 lessons of Part 4 · Bigger numbers, fractions and the calendar. 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.