4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 52 · 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. 1.5536 + 1629 =
2. 2.8360 − 7077 =
3. 3.8804 − 7966 =
4. 4.8535 − 3390 =
5. 5.8037 + 1749 =
6. 6.2393 − 1436 =
7. 7.8878 + 3915 =
8. 8.1272 + 3123 =
9. 9.2386 + 1517 =
10. 10.4740 − 2173 =
11. 11.6858 + 8979 =
12. 12.5558 + 8867 =
13. 13.2842 + 2885 =
14. 14.3085 + 1349 =
15. 15.6438 + 5644 =
16. 16.7853 + 5077 =
17. 17.3456 + 6297 =
18. 18.1526 + 7251 =
19. 19.5606 + 3057 =
20. 20.4679 − 4031 =
21. 21.6223 + 1247 =
22. 22.8357 − 3410 =
23. 23.3698 + 1974 =
24. 24.7406 − 4424 =
25. 25.1224 + 1513 =
26. 26.3976 + 1471 =
27. 27.2167 + 3792 =
28. 28.6005 − 1983 =
29. 29.6340 + 7302 =
30. 30.8438 − 1541 =
31. 31.7537 + 2834 =
32. 32.2403 + 3225 =
33. 33.3010 + 5869 =
34. 34.7889 + 5163 =
35. 35.4846 − 2640 =
36. 36.4936 + 8149 =
37. 37.1366 + 1401 =
38. 38.3362 + 1865 =
39. 39.1805 + 7414 =
40. 40.4412 + 6709 =

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