4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 15 · 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. 1.6238 − 5229 =
2. 2.2130 − 1275 =
3. 3.3523 − 2250 =
4. 4.7584 + 4831 =
5. 5.5754 − 2707 =
6. 6.7537 + 8870 =
7. 7.4894 + 1772 =
8. 8.6717 + 3354 =
9. 9.8828 − 7304 =
10. 10.6414 − 2516 =
11. 11.2711 + 5039 =
12. 12.7673 − 5789 =
13. 13.8444 − 4253 =
14. 14.3339 + 7245 =
15. 15.6851 − 5504 =
16. 16.2226 + 3238 =
17. 17.6772 − 6404 =
18. 18.4803 + 8870 =
19. 19.5395 − 3724 =
20. 20.6799 + 1765 =
21. 21.5188 − 3174 =
22. 22.7404 − 2828 =
23. 23.4254 − 3163 =
24. 24.5795 − 3453 =
25. 25.7954 + 6632 =
26. 26.6211 − 5448 =
27. 27.6706 + 5200 =
28. 28.7368 + 2175 =
29. 29.7266 − 3063 =
30. 30.1525 − 1335 =
31. 31.3299 − 2091 =
32. 32.8565 − 1469 =
33. 33.6609 − 2353 =
34. 34.2692 + 8745 =
35. 35.8877 − 7532 =
36. 36.6835 − 3655 =
37. 37.6859 + 6496 =
38. 38.5193 + 3210 =
39. 39.3526 + 7782 =
40. 40.2656 − 2354 =

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