4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 104 · 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. 1.4241 + 5235 =
2. 2.8204 + 8795 =
3. 3.1562 + 3022 =
4. 4.8818 − 2091 =
5. 5.8930 − 7818 =
6. 6.7473 + 1778 =
7. 7.3525 − 1496 =
8. 8.6051 − 4342 =
9. 9.6725 + 7576 =
10. 10.6477 − 1287 =
11. 11.8128 − 2712 =
12. 12.2808 + 7004 =
13. 13.3454 − 2110 =
14. 14.3116 − 2269 =
15. 15.6205 + 7619 =
16. 16.2935 − 2687 =
17. 17.7130 + 2315 =
18. 18.4143 + 8867 =
19. 19.5602 + 3291 =
20. 20.6877 − 2179 =
21. 21.4066 − 2816 =
22. 22.8885 − 6542 =
23. 23.2389 + 5994 =
24. 24.5983 − 4183 =
25. 25.3842 − 2580 =
26. 26.3741 + 1970 =
27. 27.5726 + 3418 =
28. 28.4379 − 3941 =
29. 29.8456 − 2179 =
30. 30.8795 − 1967 =
31. 31.5141 − 2240 =
32. 32.3015 − 2415 =
33. 33.5060 + 7379 =
34. 34.3396 − 2208 =
35. 35.6238 + 2794 =
36. 36.4272 − 1765 =
37. 37.5905 + 1990 =
38. 38.1904 + 6312 =
39. 39.1425 + 2329 =
40. 40.4223 − 4086 =

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