4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 26 · 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. 1.3545 + 7976 =
2. 2.1183 + 1613 =
3. 3.4795 − 4225 =
4. 4.5499 − 3004 =
5. 5.3538 + 8875 =
6. 6.7190 − 4239 =
7. 7.3262 + 3018 =
8. 8.1828 + 2102 =
9. 9.5859 − 1491 =
10. 10.3596 + 6497 =
11. 11.3515 − 2234 =
12. 12.6967 + 6956 =
13. 13.1106 + 1102 =
14. 14.2204 + 2085 =
15. 15.2919 + 6294 =
16. 16.6419 − 2468 =
17. 17.7486 + 2832 =
18. 18.5027 − 1928 =
19. 19.4205 + 3496 =
20. 20.2743 + 7177 =
21. 21.2783 + 1687 =
22. 22.7338 − 2151 =
23. 23.8117 + 2273 =
24. 24.7211 − 1601 =
25. 25.6909 + 5574 =
26. 26.3055 + 2610 =
27. 27.6206 + 4427 =
28. 28.5446 + 4033 =
29. 29.5914 + 3239 =
30. 30.4793 + 3065 =
31. 31.6746 − 2479 =
32. 32.6194 − 1891 =
33. 33.7596 + 2018 =
34. 34.2945 − 2649 =
35. 35.2033 + 1479 =
36. 36.2964 + 6457 =
37. 37.2101 + 4229 =
38. 38.5095 − 1303 =
39. 39.8518 + 4089 =
40. 40.1329 + 1448 =

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