4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 112 · 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. 1.7448 + 6853 =
2. 2.5093 − 3898 =
3. 3.7819 + 6777 =
4. 4.8590 − 7378 =
5. 5.5618 + 7593 =
6. 6.2482 + 1909 =
7. 7.6314 + 4883 =
8. 8.7171 − 6518 =
9. 9.6321 − 1533 =
10. 10.7943 + 4810 =
11. 11.6181 − 1884 =
12. 12.4561 + 2914 =
13. 13.6625 − 3686 =
14. 14.5907 + 4488 =
15. 15.3219 + 8858 =
16. 16.8423 + 5413 =
17. 17.2325 + 2651 =
18. 18.2981 − 2311 =
19. 19.8185 − 2139 =
20. 20.8365 + 7175 =
21. 21.5051 + 8906 =
22. 22.5122 − 1646 =
23. 23.5130 − 2774 =
24. 24.8449 + 2247 =
25. 25.8841 − 3781 =
26. 26.8935 − 1815 =
27. 27.6770 − 4754 =
28. 28.2700 + 1685 =
29. 29.5487 − 3444 =
30. 30.8844 − 2588 =
31. 31.4760 + 1216 =
32. 32.3720 − 2266 =
33. 33.7249 + 6281 =
34. 34.1257 + 2518 =
35. 35.4711 − 1628 =
36. 36.6301 − 1649 =
37. 37.2807 + 1492 =
38. 38.5883 − 5314 =
39. 39.8815 − 4571 =
40. 40.8588 − 1824 =

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