4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 181 · 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. 1.3999 − 2994 =
2. 2.2840 + 6982 =
3. 3.8092 − 6195 =
4. 4.4205 + 6612 =
5. 5.5041 + 7957 =
6. 6.5738 − 3819 =
7. 7.1260 + 7610 =
8. 8.6120 − 5406 =
9. 9.5262 + 5766 =
10. 10.6413 − 2179 =
11. 11.3509 + 5506 =
12. 12.8521 − 2843 =
13. 13.2026 + 2712 =
14. 14.8133 − 4239 =
15. 15.4092 + 5002 =
16. 16.2783 + 4763 =
17. 17.8918 + 6347 =
18. 18.6381 + 8407 =
19. 19.2804 + 2919 =
20. 20.2374 + 2752 =
21. 21.4212 − 2901 =
22. 22.3275 + 4711 =
23. 23.5545 − 1145 =
24. 24.8879 − 8106 =
25. 25.7437 − 2079 =
26. 26.2417 − 1602 =
27. 27.5733 − 2755 =
28. 28.7690 − 2028 =
29. 29.5458 − 2911 =
30. 30.4026 − 2116 =
31. 31.6210 − 5854 =
32. 32.3154 + 6836 =
33. 33.7623 + 4980 =
34. 34.7109 + 3215 =
35. 35.5686 + 2795 =
36. 36.2014 + 8424 =
37. 37.8246 − 4931 =
38. 38.4016 − 2506 =
39. 39.4051 + 5361 =
40. 40.7890 − 3821 =

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