4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 101 · 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. 1.5879 − 4518 =
2. 2.8550 − 3481 =
3. 3.5439 − 2823 =
4. 4.5589 + 2889 =
5. 5.5839 + 6966 =
6. 6.8470 − 1772 =
7. 7.6952 − 6290 =
8. 8.5759 − 5163 =
9. 9.7460 − 3015 =
10. 10.5243 + 2362 =
11. 11.2189 + 2100 =
12. 12.2965 + 8128 =
13. 13.8013 − 3828 =
14. 14.5901 − 2685 =
15. 15.3705 − 1260 =
16. 16.3253 + 6654 =
17. 17.7096 − 6892 =
18. 18.8096 + 2916 =
19. 19.4694 + 4430 =
20. 20.6829 − 1198 =
21. 21.8340 + 3352 =
22. 22.5825 + 4511 =
23. 23.6073 + 6706 =
24. 24.1828 + 4530 =
25. 25.1545 + 7160 =
26. 26.7277 + 2489 =
27. 27.8999 − 4628 =
28. 28.4923 + 6904 =
29. 29.2768 + 6839 =
30. 30.7433 − 2129 =
31. 31.5525 − 3975 =
32. 32.4725 − 4442 =
33. 33.1582 + 6499 =
34. 34.6398 + 2841 =
35. 35.8938 − 8108 =
36. 36.8578 + 1401 =
37. 37.7330 + 6420 =
38. 38.6512 − 3396 =
39. 39.7445 − 4780 =
40. 40.6536 + 7956 =

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