4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 194 · 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. 1.5792 + 5461 =
2. 2.2379 + 4797 =
3. 3.6921 + 2774 =
4. 4.5239 + 6688 =
5. 5.7908 − 1848 =
6. 6.7227 − 2295 =
7. 7.5317 − 4578 =
8. 8.6235 − 1194 =
9. 9.8768 − 3949 =
10. 10.6811 + 7253 =
11. 11.7948 + 7984 =
12. 12.8600 + 5840 =
13. 13.1353 + 6560 =
14. 14.3197 + 7453 =
15. 15.1179 + 6342 =
16. 16.8848 − 2928 =
17. 17.7996 + 2357 =
18. 18.5130 − 1814 =
19. 19.5680 + 4265 =
20. 20.7915 + 5748 =
21. 21.4467 + 8629 =
22. 22.8954 + 5894 =
23. 23.2907 + 2382 =
24. 24.2983 + 1202 =
25. 25.6908 − 6409 =
26. 26.4735 − 1182 =
27. 27.3115 + 7798 =
28. 28.6302 − 4865 =
29. 29.5642 + 4567 =
30. 30.8038 − 4641 =
31. 31.7329 − 1410 =
32. 32.7871 − 6240 =
33. 33.6361 + 5685 =
34. 34.5304 − 2184 =
35. 35.2714 − 2471 =
36. 36.5003 + 4546 =
37. 37.7136 + 3005 =
38. 38.7942 − 4706 =
39. 39.6281 − 4399 =
40. 40.8520 + 1375 =

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