4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 100 · 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. 1.2547 − 2053 =
2. 2.2039 + 3547 =
3. 3.8334 + 3548 =
4. 4.1769 − 1679 =
5. 5.8110 − 5958 =
6. 6.3306 − 2378 =
7. 7.2115 + 4026 =
8. 8.5323 − 1251 =
9. 9.4028 + 2539 =
10. 10.2891 + 7320 =
11. 11.3650 − 1581 =
12. 12.8497 − 2698 =
13. 13.7751 − 6749 =
14. 14.6161 − 3178 =
15. 15.7725 − 5968 =
16. 16.8369 + 7168 =
17. 17.7589 − 4103 =
18. 18.2704 + 8278 =
19. 19.7788 − 5266 =
20. 20.8089 + 2532 =
21. 21.8742 + 2825 =
22. 22.4769 + 7227 =
23. 23.6193 − 3076 =
24. 24.7480 − 3498 =
25. 25.4901 − 4412 =
26. 26.6902 + 1105 =
27. 27.7546 − 3348 =
28. 28.3643 + 5474 =
29. 29.5908 − 2762 =
30. 30.8537 − 2233 =
31. 31.3848 − 1741 =
32. 32.8964 − 1176 =
33. 33.2306 + 3222 =
34. 34.5888 − 3110 =
35. 35.5953 − 2740 =
36. 36.4863 − 1572 =
37. 37.8486 + 2258 =
38. 38.3871 − 3223 =
39. 39.5602 + 4427 =
40. 40.7922 − 6362 =

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