4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 115 · 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. 1.3018 + 4242 =
2. 2.6014 + 4902 =
3. 3.8476 − 1292 =
4. 4.8745 − 4698 =
5. 5.8609 + 6941 =
6. 6.3669 + 1812 =
7. 7.8945 + 1927 =
8. 8.2050 + 1340 =
9. 9.7443 − 1916 =
10. 10.1937 − 1671 =
11. 11.7016 + 1886 =
12. 12.1931 + 4317 =
13. 13.8640 − 3247 =
14. 14.1122 + 3249 =
15. 15.6707 + 5869 =
16. 16.2417 + 1207 =
17. 17.2252 − 1749 =
18. 18.5769 − 4423 =
19. 19.6918 − 2532 =
20. 20.5924 − 2492 =
21. 21.4008 + 8004 =
22. 22.6378 − 3861 =
23. 23.7494 + 3040 =
24. 24.4113 + 7235 =
25. 25.4171 − 2015 =
26. 26.3660 − 2372 =
27. 27.2912 + 2107 =
28. 28.2884 + 8289 =
29. 29.7377 − 4508 =
30. 30.8459 − 4286 =
31. 31.5550 + 7949 =
32. 32.5121 + 2880 =
33. 33.2815 − 2558 =
34. 34.2849 + 6173 =
35. 35.7908 − 3001 =
36. 36.7517 − 1143 =
37. 37.3174 + 7671 =
38. 38.8926 − 4730 =
39. 39.2891 − 2801 =
40. 40.8619 − 3800 =

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