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The answer to a subtraction is the gap between two numbers. If you add the same amount to both numbers, the gap does not change. So push the number you take away up to a round ten, push the other number up by the same amount, and the sum becomes easy.
✓ You passed this lesson’s test.
Shift both — “moving both numbers by the same amount keeps the gap the same”
Use it for: Working out change, differences in marks or ages, and any subtraction that would need borrowing.
Check: 355 + 68 = 423 ✓
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 — and beat the clock: finish within 2 min 30 s.
🏅 Sign in with Google to earn the 🧮 Gap Sprinter badge when you pass — and a certificate when you finish all 5 lessons of Part 1 · Speed adding & subtracting. 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.