4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 1 · 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. 1.4454 + 2139 =
2. 2.4018 + 2491 =
3. 3.3137 − 2684 =
4. 4.4583 − 1623 =
5. 5.4423 − 3428 =
6. 6.7920 − 7457 =
7. 7.5765 + 8479 =
8. 8.8408 − 1469 =
9. 9.7427 − 2012 =
10. 10.2826 + 6607 =
11. 11.8380 + 7503 =
12. 12.3873 + 4127 =
13. 13.8480 − 4935 =
14. 14.8006 + 1210 =
15. 15.3051 + 8387 =
16. 16.8618 − 4733 =
17. 17.3268 + 4232 =
18. 18.8875 − 4171 =
19. 19.6275 − 2598 =
20. 20.7375 + 1695 =
21. 21.6233 − 2819 =
22. 22.7365 − 4952 =
23. 23.1253 + 2896 =
24. 24.6437 − 4699 =
25. 25.5918 − 4833 =
26. 26.7546 + 3940 =
27. 27.3429 + 2672 =
28. 28.5939 − 3104 =
29. 29.2721 + 7622 =
30. 30.8498 − 4565 =
31. 31.2801 − 2404 =
32. 32.8433 + 8729 =
33. 33.6149 − 5900 =
34. 34.3030 + 7585 =
35. 35.2493 + 5301 =
36. 36.6203 − 6029 =
37. 37.5281 − 4209 =
38. 38.8084 − 2238 =
39. 39.2826 + 2240 =
40. 40.2921 − 1589 =

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