4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 208 · 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. 1.1153 + 8801 =
2. 2.7502 − 2034 =
3. 3.5961 + 5014 =
4. 4.8745 − 8109 =
5. 5.2113 − 1346 =
6. 6.7476 + 1532 =
7. 7.7030 − 1732 =
8. 8.2092 + 1854 =
9. 9.4373 + 1823 =
10. 10.2342 + 3172 =
11. 11.7860 + 8416 =
12. 12.6982 − 1706 =
13. 13.1194 + 7256 =
14. 14.6633 + 4899 =
15. 15.1160 + 6036 =
16. 16.5592 − 2365 =
17. 17.4839 − 4586 =
18. 18.1889 + 4850 =
19. 19.6917 − 6471 =
20. 20.5146 − 3182 =
21. 21.6407 + 3032 =
22. 22.3697 − 1419 =
23. 23.2234 + 2346 =
24. 24.5052 + 5426 =
25. 25.6847 − 2185 =
26. 26.8482 − 1985 =
27. 27.2797 + 6835 =
28. 28.1527 + 4042 =
29. 29.5237 − 2168 =
30. 30.7982 + 3131 =
31. 31.1539 + 4862 =
32. 32.5631 − 2005 =
33. 33.4156 − 3814 =
34. 34.1466 − 1457 =
35. 35.7221 − 5325 =
36. 36.2262 − 1897 =
37. 37.7801 − 1174 =
38. 38.5544 − 4594 =
39. 39.4249 + 6107 =
40. 40.5831 + 8965 =

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