4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 59 · 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. 1.6327 + 8981 =
2. 2.1748 + 3509 =
3. 3.7468 − 2054 =
4. 4.1163 + 4953 =
5. 5.4145 + 6856 =
6. 6.6052 − 5735 =
7. 7.8422 + 7116 =
8. 8.7343 − 2854 =
9. 9.7497 − 4346 =
10. 10.6625 − 3976 =
11. 11.5537 + 5314 =
12. 12.6911 − 5025 =
13. 13.6139 + 8445 =
14. 14.8092 − 3582 =
15. 15.2301 + 2732 =
16. 16.1153 + 2298 =
17. 17.6155 − 1337 =
18. 18.6268 + 2614 =
19. 19.5139 + 3537 =
20. 20.7075 + 3304 =
21. 21.1544 + 5474 =
22. 22.4729 + 7720 =
23. 23.1921 + 2091 =
24. 24.2658 + 2722 =
25. 25.2458 + 2434 =
26. 26.7999 − 1233 =
27. 27.6844 + 7002 =
28. 28.5532 − 4234 =
29. 29.8491 + 3737 =
30. 30.4060 + 3990 =
31. 31.5421 + 5682 =
32. 32.4763 + 2162 =
33. 33.4910 + 4546 =
34. 34.6415 + 4215 =
35. 35.6445 + 7011 =
36. 36.4319 + 3245 =
37. 37.4292 + 6456 =
38. 38.7721 − 5050 =
39. 39.2211 + 8010 =
40. 40.2370 − 2175 =

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