4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 84 · 40 questions

The fast method (Split and join): Split each 4-digit number into two 2-digit halves: 4768 → 47|68. Work out the left halves and the right halves on their own. Adding: a right half of 100 or more carries 1 to the left half. Subtracting: right half too small? Borrow 1 from the left half — it is worth 100 on the right.

1. 1.8504 − 5659 =
2. 2.2109 + 1240 =
3. 3.7777 − 5069 =
4. 4.8428 + 8800 =
5. 5.1862 + 7031 =
6. 6.8260 + 8322 =
7. 7.1460 + 8712 =
8. 8.7056 − 6725 =
9. 9.2816 − 1471 =
10. 10.2390 + 3142 =
11. 11.6929 − 1327 =
12. 12.7175 − 3017 =
13. 13.6563 − 3897 =
14. 14.5915 − 2403 =
15. 15.2455 + 7525 =
16. 16.5525 + 6404 =
17. 17.3018 + 2769 =
18. 18.4521 + 2494 =
19. 19.6951 + 1323 =
20. 20.1730 + 3211 =
21. 21.1895 + 6331 =
22. 22.2519 + 2108 =
23. 23.3363 + 1900 =
24. 24.6600 − 3132 =
25. 25.8792 − 4243 =
26. 26.3177 + 7050 =
27. 27.6107 + 6033 =
28. 28.5169 + 6297 =
29. 29.4333 + 7235 =
30. 30.4427 − 2043 =
31. 31.3800 − 1213 =
32. 32.3940 − 1801 =
33. 33.2601 + 1385 =
34. 34.3434 + 4735 =
35. 35.7874 − 5625 =
36. 36.3435 + 1713 =
37. 37.3327 + 8851 =
38. 38.8202 − 1588 =
39. 39.6779 + 8866 =
40. 40.8872 − 2315 =

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