4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 8 · 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. 1.8957 − 4398 =
2. 2.3693 + 5756 =
3. 3.3633 − 1270 =
4. 4.8909 − 7623 =
5. 5.7471 + 3240 =
6. 6.3382 − 1238 =
7. 7.4573 + 3952 =
8. 8.7108 − 6758 =
9. 9.2007 + 6015 =
10. 10.3321 − 1843 =
11. 11.7885 − 2681 =
12. 12.2467 + 5809 =
13. 13.8848 − 6763 =
14. 14.3488 + 2111 =
15. 15.8309 − 6721 =
16. 16.6919 − 2891 =
17. 17.7783 + 4365 =
18. 18.1356 + 5229 =
19. 19.6459 − 5827 =
20. 20.8877 − 7609 =
21. 21.4728 + 2068 =
22. 22.4384 + 4145 =
23. 23.8169 + 2025 =
24. 24.4238 + 2992 =
25. 25.4873 + 3014 =
26. 26.8670 + 4991 =
27. 27.3017 + 8669 =
28. 28.1131 + 1659 =
29. 29.7815 − 4679 =
30. 30.3139 − 2504 =
31. 31.3888 + 2019 =
32. 32.2779 − 1109 =
33. 33.8175 − 4865 =
34. 34.7799 − 2440 =
35. 35.7710 + 2549 =
36. 36.7702 − 4488 =
37. 37.3101 + 3048 =
38. 38.7381 − 2957 =
39. 39.3253 + 7132 =
40. 40.6092 + 1741 =

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