4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 14 · 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. 1.1704 + 6270 =
2. 2.3927 + 3542 =
3. 3.5386 − 1457 =
4. 4.7797 − 4548 =
5. 5.5240 + 2239 =
6. 6.5455 − 4988 =
7. 7.5405 + 8888 =
8. 8.3006 + 3031 =
9. 9.6237 + 3301 =
10. 10.6112 − 5175 =
11. 11.3604 − 3571 =
12. 12.2245 + 7705 =
13. 13.8996 + 5762 =
14. 14.2890 + 8013 =
15. 15.3419 + 8253 =
16. 16.7955 − 5382 =
17. 17.4809 − 1472 =
18. 18.7704 + 3254 =
19. 19.8393 − 1784 =
20. 20.1731 + 8551 =
21. 21.8055 − 7952 =
22. 22.1511 + 4333 =
23. 23.7449 + 2506 =
24. 24.4045 + 5844 =
25. 25.5941 − 1504 =
26. 26.5014 − 4322 =
27. 27.5702 − 4989 =
28. 28.7988 − 2492 =
29. 29.8764 + 8531 =
30. 30.4259 − 2941 =
31. 31.1493 + 4258 =
32. 32.5507 − 4409 =
33. 33.8881 − 8438 =
34. 34.4640 − 2151 =
35. 35.7425 + 8385 =
36. 36.1183 + 7201 =
37. 37.3569 + 7075 =
38. 38.2178 − 1268 =
39. 39.2669 + 8729 =
40. 40.5563 − 2929 =

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