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Often you do not need the exact answer — you need to know roughly how big it is. Round each number, do the easy sum, and pick the closest choice. This also catches mistakes in written answers.
✓ You passed this lesson’s test.
Round, then work — “round to tens or hundreds and do the easy sum”
Use it for: Checking a bill, guessing how many fit, and spotting a wrong answer in your homework.
Check: 48 × 31 = 1488, which is very close to 1500 ✓
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 🦅 Estimation Eagle badge when you pass — and a certificate when you finish all 6 lessons of Part 3 · Mental maths for daily life. 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.