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Big sums are done column by column. Write the numbers ones under ones and start from the right. When adding, a column of 10 or more carries 1 to the next column. When subtracting, a smaller top digit borrows 1 from the next column.
✓ You passed this lesson’s test.
Column by column — “work from the ones to the hundreds, carrying or borrowing one at a time”
Use it for: Passengers on trains, children in a school, and the addition and subtraction chapters of Class 3 maths.
Check: 834 − 378 = 456 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🧮 Three-Digit Tamer badge when you pass — and a certificate when you finish all 8 lessons of Part 3 · Class 3. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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