4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 110 · 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. 1.3337 − 2194 =
2. 2.8579 + 6001 =
3. 3.6376 + 5168 =
4. 4.2268 − 2166 =
5. 5.7329 − 6696 =
6. 6.6251 + 6735 =
7. 7.8485 + 7255 =
8. 8.5151 + 6905 =
9. 9.2066 + 8393 =
10. 10.1969 + 3352 =
11. 11.3738 + 4509 =
12. 12.4495 + 4247 =
13. 13.8305 + 8108 =
14. 14.1311 + 2843 =
15. 15.1296 + 1175 =
16. 16.3475 − 1894 =
17. 17.6588 + 7912 =
18. 18.4902 + 7969 =
19. 19.2293 + 5189 =
20. 20.7199 + 7345 =
21. 21.4944 − 2624 =
22. 22.2986 + 3317 =
23. 23.8369 − 3902 =
24. 24.4432 + 3515 =
25. 25.6793 + 6160 =
26. 26.7466 − 2707 =
27. 27.2498 − 2123 =
28. 28.5318 − 3145 =
29. 29.7340 − 2124 =
30. 30.2602 + 7102 =
31. 31.1368 + 8533 =
32. 32.5609 − 4906 =
33. 33.8423 − 2618 =
34. 34.3506 + 7912 =
35. 35.8802 − 6831 =
36. 36.6145 − 3422 =
37. 37.6430 − 4341 =
38. 38.8556 − 3239 =
39. 39.2607 + 2805 =
40. 40.7851 + 3840 =

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