4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 16 · 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. 1.3864 − 3393 =
2. 2.8192 + 7596 =
3. 3.3893 + 3410 =
4. 4.7477 + 7138 =
5. 5.8914 − 7421 =
6. 6.6292 + 7809 =
7. 7.8946 − 7248 =
8. 8.1433 + 1263 =
9. 9.7072 − 6934 =
10. 10.6297 + 7554 =
11. 11.7663 − 7551 =
12. 12.3624 + 8940 =
13. 13.4203 − 3104 =
14. 14.8612 + 1630 =
15. 15.3405 − 2214 =
16. 16.4893 − 3475 =
17. 17.8723 − 6310 =
18. 18.6938 + 8331 =
19. 19.7099 − 5542 =
20. 20.2809 + 3842 =
21. 21.8250 + 8466 =
22. 22.6389 + 3052 =
23. 23.1478 + 5538 =
24. 24.3453 + 6308 =
25. 25.8775 − 5640 =
26. 26.5096 − 3843 =
27. 27.2170 + 6358 =
28. 28.8693 + 1986 =
29. 29.3986 + 1439 =
30. 30.2901 + 6882 =
31. 31.1968 + 4537 =
32. 32.7745 − 6129 =
33. 33.4087 − 2775 =
34. 34.2849 − 2522 =
35. 35.2682 − 1780 =
36. 36.7806 + 4318 =
37. 37.8835 − 2419 =
38. 38.3153 + 1558 =
39. 39.6775 − 2284 =
40. 40.7014 + 4115 =

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