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When two numbers are close but on either side of a round number, taking away is messy. Count up from the smaller number to the bigger one in friendly jumps instead — just like a shopkeeper.
✓ You passed this lesson’s test.
Count up — “the difference is the distance from the smaller number to the bigger one”
Use it for: Sums like 1002 − 997, 52 − 47, finding how many more, and checking change.
Check: 486 + 17 = 503 ✓
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 🐸 Jumping Frog badge when you pass — and a certificate when you finish all 7 lessons of Part 1 · Mental addition & subtraction. 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.