4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 123 · 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. 1.8763 + 6093 =
2. 2.5435 + 5696 =
3. 3.7103 − 5148 =
4. 4.8263 − 5066 =
5. 5.1969 + 4058 =
6. 6.3455 + 7606 =
7. 7.4438 + 8685 =
8. 8.8594 − 8192 =
9. 9.2865 − 1400 =
10. 10.6313 − 2035 =
11. 11.4485 − 3697 =
12. 12.8226 − 8178 =
13. 13.4957 + 2096 =
14. 14.4512 + 3431 =
15. 15.2220 + 6788 =
16. 16.8455 − 3106 =
17. 17.4787 + 4825 =
18. 18.6204 − 2666 =
19. 19.4183 + 5821 =
20. 20.8745 − 2680 =
21. 21.7577 − 4551 =
22. 22.7748 − 6200 =
23. 23.7695 − 3324 =
24. 24.4806 + 7218 =
25. 25.7580 + 1669 =
26. 26.7578 + 6909 =
27. 27.7104 − 6529 =
28. 28.8846 − 3463 =
29. 29.4022 + 5177 =
30. 30.5988 − 1829 =
31. 31.5017 + 3465 =
32. 32.7060 − 7029 =
33. 33.7307 − 5228 =
34. 34.2523 + 2335 =
35. 35.5627 − 2306 =
36. 36.3249 − 2456 =
37. 37.7579 + 1796 =
38. 38.3364 − 2846 =
39. 39.3910 + 5707 =
40. 40.7258 + 4817 =

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