4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 144 · 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. 1.7435 + 4532 =
2. 2.2091 + 3189 =
3. 3.6899 − 2521 =
4. 4.6506 − 4398 =
5. 5.1917 + 5596 =
6. 6.3254 + 2587 =
7. 7.3265 − 1154 =
8. 8.4244 + 1722 =
9. 9.5718 + 8096 =
10. 10.5230 − 1581 =
11. 11.2151 + 1101 =
12. 12.6112 − 2840 =
13. 13.7415 − 1318 =
14. 14.6644 + 3306 =
15. 15.8353 + 3204 =
16. 16.7429 + 4281 =
17. 17.7411 − 5467 =
18. 18.7078 − 3812 =
19. 19.2185 − 1227 =
20. 20.6977 − 6972 =
21. 21.2678 + 1627 =
22. 22.5576 − 2784 =
23. 23.5806 − 1194 =
24. 24.7604 + 1922 =
25. 25.2502 − 2146 =
26. 26.3165 + 1459 =
27. 27.4930 + 4000 =
28. 28.4758 + 3875 =
29. 29.5465 + 5634 =
30. 30.6552 − 3198 =
31. 31.7368 − 3657 =
32. 32.5781 + 6608 =
33. 33.8059 + 6250 =
34. 34.6994 − 5306 =
35. 35.1132 + 3313 =
36. 36.7004 − 6060 =
37. 37.6354 − 5624 =
38. 38.6948 + 8586 =
39. 39.3681 + 6315 =
40. 40.4898 + 7036 =

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