4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 6 · 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. 1.6221 − 1801 =
2. 2.1127 + 5305 =
3. 3.7053 − 2098 =
4. 4.5455 + 7895 =
5. 5.4108 + 2468 =
6. 6.6559 − 2274 =
7. 7.4976 + 8489 =
8. 8.7203 + 5331 =
9. 9.7150 − 5229 =
10. 10.3983 + 1868 =
11. 11.8960 + 6060 =
12. 12.5120 + 5932 =
13. 13.8701 − 1258 =
14. 14.5720 + 8338 =
15. 15.2950 + 3699 =
16. 16.5688 − 1850 =
17. 17.5869 − 2123 =
18. 18.7826 − 2806 =
19. 19.6655 − 4557 =
20. 20.6878 − 5423 =
21. 21.5283 − 1485 =
22. 22.5391 − 1625 =
23. 23.7237 − 1749 =
24. 24.3798 − 2524 =
25. 25.6994 + 2109 =
26. 26.1886 + 1684 =
27. 27.7604 − 3049 =
28. 28.6793 − 5891 =
29. 29.4969 + 4494 =
30. 30.6335 − 2721 =
31. 31.8240 + 2744 =
32. 32.5609 + 4291 =
33. 33.8085 − 1495 =
34. 34.7127 + 5008 =
35. 35.8570 − 6062 =
36. 36.2847 + 3999 =
37. 37.8908 + 3124 =
38. 38.4934 − 4352 =
39. 39.6236 − 5216 =
40. 40.4294 − 2758 =

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