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A 4-digit sum is really two 2-digit sums side by side. Cut each number in the middle, add or subtract the left halves and the right halves on their own, and only then look at the join: a right half of 100 or more carries 1 to the left, and a right half that is too small borrows 1 from the left.
✓ You passed this lesson’s test.
Split and join — “cut each number into two 2-digit halves, work them separately, fix the join”
Use it for: Bills and budgets, adding marks or distances, year gaps in history, and long sums in Class 5–8 without paper.
Check: 8425 − 3657 = 4768 ✓
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 4 min.
🏅 Sign in with Google to earn the 🧩 Split-Join Star badge when you pass — and a certificate when you finish all 10 lessons of Part 4 · Speed decimals, fractions and percentages. 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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