4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 173 · 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. 1.2278 − 1417 =
2. 2.2010 + 8244 =
3. 3.5109 + 8510 =
4. 4.8182 + 8382 =
5. 5.2023 + 2753 =
6. 6.6615 − 5460 =
7. 7.5808 − 3579 =
8. 8.2563 + 4756 =
9. 9.1218 + 2654 =
10. 10.2043 − 1983 =
11. 11.6054 + 3966 =
12. 12.2210 + 8187 =
13. 13.5006 − 1759 =
14. 14.1586 + 8008 =
15. 15.8390 + 2974 =
16. 16.2293 + 6056 =
17. 17.8236 − 4700 =
18. 18.5086 + 8597 =
19. 19.4905 − 4652 =
20. 20.5592 − 3622 =
21. 21.4141 + 1502 =
22. 22.4648 + 2364 =
23. 23.1534 + 2312 =
24. 24.6048 − 1767 =
25. 25.5700 − 2787 =
26. 26.3981 − 1979 =
27. 27.3688 + 4117 =
28. 28.1391 + 4989 =
29. 29.2386 + 4112 =
30. 30.3941 + 1991 =
31. 31.5375 − 2856 =
32. 32.5345 − 3305 =
33. 33.1529 + 4090 =
34. 34.1914 + 3561 =
35. 35.6478 − 1742 =
36. 36.1935 + 5260 =
37. 37.4631 + 8808 =
38. 38.6418 − 5762 =
39. 39.3648 − 2141 =
40. 40.6188 + 2797 =

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