4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 150 · 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. 1.2424 + 7257 =
2. 2.7879 + 3319 =
3. 3.4355 − 1188 =
4. 4.7793 − 6557 =
5. 5.7178 − 4780 =
6. 6.7193 + 6221 =
7. 7.8612 + 6476 =
8. 8.8214 + 2989 =
9. 9.7328 − 1185 =
10. 10.5150 − 2559 =
11. 11.7937 + 5994 =
12. 12.5503 + 7220 =
13. 13.2962 + 6819 =
14. 14.4782 − 4561 =
15. 15.4421 + 6454 =
16. 16.8222 + 4574 =
17. 17.7988 + 7745 =
18. 18.5111 − 2141 =
19. 19.2675 − 1758 =
20. 20.6941 + 2933 =
21. 21.5431 + 5881 =
22. 22.4364 − 1932 =
23. 23.5758 − 2856 =
24. 24.5331 + 3734 =
25. 25.2084 − 1671 =
26. 26.4574 − 4299 =
27. 27.5633 − 2820 =
28. 28.8055 − 4659 =
29. 29.8181 + 1462 =
30. 30.6265 − 5747 =
31. 31.7021 − 1399 =
32. 32.6333 + 5775 =
33. 33.7579 − 7225 =
34. 34.7659 + 2320 =
35. 35.5519 + 8170 =
36. 36.8858 − 2428 =
37. 37.6734 − 2810 =
38. 38.7950 + 4338 =
39. 39.8590 − 4570 =
40. 40.8363 − 2975 =

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