TalentJR apps
For a quick division, round the divisor to the nearest ten and see which multiple is closest. For a square root, guess the nearest whole number, divide by your guess, and take the average of the two — it lands right next to the true root.
✓ You passed this lesson’s test.
Guess, divide, average — “a good guess and a little division get you very close”
Use it for: Checking a calculator, Class 8 square roots, and guessing sizes of square plots.
Check: 6.3 × 6.3 = 39.69, very close to 40 ✓
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 🔭 Root Guesser 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.