4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 175 · 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. 1.1578 + 2411 =
2. 2.6702 + 4991 =
3. 3.4661 − 1524 =
4. 4.3146 + 3413 =
5. 5.4826 − 3131 =
6. 6.7879 + 1743 =
7. 7.7168 − 6725 =
8. 8.6311 + 8222 =
9. 9.2520 + 7974 =
10. 10.7245 − 7243 =
11. 11.7466 − 4246 =
12. 12.2802 − 2058 =
13. 13.5410 − 5122 =
14. 14.5643 + 8577 =
15. 15.2560 + 3242 =
16. 16.8050 + 2954 =
17. 17.6984 + 4755 =
18. 18.7152 − 2074 =
19. 19.1482 + 4837 =
20. 20.5213 − 2201 =
21. 21.5571 + 5065 =
22. 22.7380 − 4154 =
23. 23.7519 − 2589 =
24. 24.1678 − 1594 =
25. 25.8063 − 1787 =
26. 26.7323 − 7109 =
27. 27.2050 + 3367 =
28. 28.5310 + 3586 =
29. 29.8061 + 1965 =
30. 30.7293 − 2859 =
31. 31.7137 − 6657 =
32. 32.7811 + 2229 =
33. 33.3924 − 2411 =
34. 34.5350 − 5108 =
35. 35.8173 − 1699 =
36. 36.3183 − 3173 =
37. 37.8740 − 5058 =
38. 38.5619 + 8339 =
39. 39.6749 − 1655 =
40. 40.6676 − 4175 =

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