4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 41 · 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. 1.2460 + 3374 =
2. 2.2484 + 8077 =
3. 3.6773 − 6166 =
4. 4.8553 + 1730 =
5. 5.7096 − 5269 =
6. 6.3145 − 2229 =
7. 7.6305 − 3941 =
8. 8.3140 + 7806 =
9. 9.6253 − 2868 =
10. 10.7390 − 5056 =
11. 11.1686 − 1251 =
12. 12.6101 − 3905 =
13. 13.8636 − 4255 =
14. 14.4438 − 3546 =
15. 15.7637 − 6570 =
16. 16.7138 − 5864 =
17. 17.3053 − 1438 =
18. 18.6812 + 1179 =
19. 19.7545 + 1393 =
20. 20.4904 − 2846 =
21. 21.5156 + 3850 =
22. 22.5670 + 4007 =
23. 23.2425 − 2354 =
24. 24.6314 − 1574 =
25. 25.4345 + 6456 =
26. 26.2324 + 2707 =
27. 27.1405 + 6045 =
28. 28.8696 − 2909 =
29. 29.7250 − 1261 =
30. 30.7438 + 6806 =
31. 31.3064 + 1427 =
32. 32.3902 − 2485 =
33. 33.8491 + 2617 =
34. 34.2375 − 1137 =
35. 35.7021 + 7390 =
36. 36.6978 − 6806 =
37. 37.7781 − 1214 =
38. 38.5886 + 6911 =
39. 39.6948 + 1892 =
40. 40.8278 + 5116 =

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