4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 202 · 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. 1.1824 + 6308 =
2. 2.3114 − 1870 =
3. 3.3593 + 2791 =
4. 4.7663 − 6119 =
5. 5.4295 + 1693 =
6. 6.8357 − 6486 =
7. 7.1289 + 4950 =
8. 8.4161 + 3932 =
9. 9.1915 − 1377 =
10. 10.1740 + 1495 =
11. 11.6778 − 3779 =
12. 12.8887 − 7354 =
13. 13.6903 + 2022 =
14. 14.6694 + 5454 =
15. 15.4854 − 2497 =
16. 16.1999 + 3718 =
17. 17.5069 + 2485 =
18. 18.7892 − 3976 =
19. 19.7751 − 7145 =
20. 20.1708 + 6699 =
21. 21.7423 − 1706 =
22. 22.6745 + 7831 =
23. 23.1546 + 2724 =
24. 24.7771 − 1753 =
25. 25.7998 − 1517 =
26. 26.2525 + 1589 =
27. 27.5022 − 2218 =
28. 28.8934 − 5803 =
29. 29.1899 + 1804 =
30. 30.3325 + 1201 =
31. 31.6684 + 4546 =
32. 32.8953 − 5098 =
33. 33.2802 + 4996 =
34. 34.8068 − 2163 =
35. 35.8185 − 1851 =
36. 36.4586 − 3135 =
37. 37.8858 − 2163 =
38. 38.5084 − 2391 =
39. 39.6318 − 4948 =
40. 40.6345 + 4757 =

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