4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 80 · 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. 1.3931 + 4667 =
2. 2.8525 − 2942 =
3. 3.4718 − 3642 =
4. 4.6222 + 8885 =
5. 5.7269 − 1937 =
6. 6.3689 − 1695 =
7. 7.1305 − 1258 =
8. 8.6336 − 4010 =
9. 9.2050 + 2106 =
10. 10.7417 − 3650 =
11. 11.1648 − 1415 =
12. 12.2183 + 1123 =
13. 13.3950 + 4331 =
14. 14.8943 − 5124 =
15. 15.7902 − 7795 =
16. 16.7799 − 2749 =
17. 17.5406 − 2034 =
18. 18.2063 + 1796 =
19. 19.2377 + 8520 =
20. 20.7959 + 6674 =
21. 21.3054 + 7260 =
22. 22.5488 − 4562 =
23. 23.4082 − 3148 =
24. 24.4502 + 4481 =
25. 25.4644 − 2060 =
26. 26.6116 + 5573 =
27. 27.5415 + 6405 =
28. 28.2557 + 6743 =
29. 29.2853 + 7307 =
30. 30.7849 − 2573 =
31. 31.5664 + 8139 =
32. 32.7477 − 1968 =
33. 33.8317 − 4815 =
34. 34.4350 + 6280 =
35. 35.5393 + 4029 =
36. 36.5570 − 3904 =
37. 37.8411 + 2667 =
38. 38.7516 − 1766 =
39. 39.5422 + 4093 =
40. 40.3554 + 1660 =

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths