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Adding a long column one number at a time is slow. Speed adders scan the column first and pair up numbers that make 10 — 1 and 9, 2 and 8, 3 and 7, 4 and 6, 5 and 5. Tens are easy to count, so the rest is quick.
✓ You passed this lesson’s test.
Make tens — “join numbers that make 10 before adding anything else”
Use it for: Adding scores, bills and marks, and every long addition where the ones column is full of digits.
Check: Left to right: 8 + 3 = 11, 2 + 7 = 9, 11 + 9 + 5 = 25 ✓
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.
🏅 Sign in with Google to earn the ⚡ Lightning Adder 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.