4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 129 · 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. 1.8337 − 1417 =
2. 2.8689 − 3924 =
3. 3.5536 − 1823 =
4. 4.3156 − 1254 =
5. 5.5518 + 1467 =
6. 6.7281 − 2091 =
7. 7.6261 + 4153 =
8. 8.6803 − 1807 =
9. 9.3252 + 1793 =
10. 10.6720 + 4985 =
11. 11.6217 − 4023 =
12. 12.3618 − 1739 =
13. 13.2596 + 5203 =
14. 14.1492 + 7390 =
15. 15.4934 + 7127 =
16. 16.2605 − 2148 =
17. 17.5161 + 7698 =
18. 18.3609 + 5966 =
19. 19.8353 + 3068 =
20. 20.5467 + 3189 =
21. 21.4560 + 1729 =
22. 22.4785 − 2726 =
23. 23.8711 − 8425 =
24. 24.8020 − 2051 =
25. 25.6020 − 3717 =
26. 26.7752 − 5401 =
27. 27.2426 − 1463 =
28. 28.7452 − 4142 =
29. 29.7006 + 3926 =
30. 30.7448 − 6374 =
31. 31.2365 + 7735 =
32. 32.1807 + 7687 =
33. 33.2516 + 3064 =
34. 34.5237 − 1289 =
35. 35.7767 + 3669 =
36. 36.1325 − 1213 =
37. 37.5027 + 4195 =
38. 38.4530 + 7492 =
39. 39.8080 − 3485 =
40. 40.6816 + 2215 =

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