4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 71 · 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. 1.8911 − 1957 =
2. 2.1127 + 5120 =
3. 3.6395 + 7784 =
4. 4.4417 + 8253 =
5. 5.7677 + 7989 =
6. 6.6984 − 4887 =
7. 7.8544 − 8346 =
8. 8.7951 − 5104 =
9. 9.5699 − 2016 =
10. 10.6529 + 5533 =
11. 11.4274 − 3628 =
12. 12.8857 + 8912 =
13. 13.3369 + 8048 =
14. 14.6145 + 3222 =
15. 15.2720 + 7471 =
16. 16.3533 + 5442 =
17. 17.2202 − 1458 =
18. 18.2434 + 2644 =
19. 19.2121 + 3741 =
20. 20.7444 − 5914 =
21. 21.2785 + 7820 =
22. 22.4881 − 2388 =
23. 23.7638 − 4497 =
24. 24.6229 + 4953 =
25. 25.5624 + 3043 =
26. 26.4169 + 3815 =
27. 27.7595 − 4728 =
28. 28.1115 + 3401 =
29. 29.6509 − 3170 =
30. 30.4478 − 2904 =
31. 31.8607 − 1732 =
32. 32.7496 − 4943 =
33. 33.6412 − 4795 =
34. 34.8099 − 6831 =
35. 35.4983 + 8303 =
36. 36.5804 + 2371 =
37. 37.8656 − 3948 =
38. 38.6156 − 5049 =
39. 39.6768 + 8692 =
40. 40.6327 − 4028 =

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