4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 118 · 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. 1.8135 + 2244 =
2. 2.8233 − 2643 =
3. 3.4854 + 8333 =
4. 4.8286 + 6749 =
5. 5.4611 − 3485 =
6. 6.6870 + 7801 =
7. 7.7793 − 5014 =
8. 8.5443 − 3618 =
9. 9.8984 − 6085 =
10. 10.3531 + 7110 =
11. 11.3701 + 2293 =
12. 12.5721 + 1976 =
13. 13.1690 − 1391 =
14. 14.3031 − 1614 =
15. 15.8992 − 2982 =
16. 16.6412 − 2227 =
17. 17.1890 + 8139 =
18. 18.6335 − 3148 =
19. 19.6055 − 1822 =
20. 20.5765 + 8200 =
21. 21.2064 + 7035 =
22. 22.7506 − 2272 =
23. 23.3758 − 2536 =
24. 24.7563 + 7108 =
25. 25.4515 − 1488 =
26. 26.5635 − 3895 =
27. 27.7698 − 6119 =
28. 28.5053 + 8154 =
29. 29.4902 + 1477 =
30. 30.7596 + 1143 =
31. 31.5552 − 1962 =
32. 32.8903 − 2422 =
33. 33.1416 + 3845 =
34. 34.3083 + 2919 =
35. 35.1869 + 8585 =
36. 36.1652 + 8612 =
37. 37.6435 − 2150 =
38. 38.6939 + 6625 =
39. 39.7727 − 2073 =
40. 40.5115 − 3022 =

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