4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 212 · 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. 1.6547 + 6558 =
2. 2.7510 + 7333 =
3. 3.6299 + 2421 =
4. 4.3446 − 1678 =
5. 5.1613 + 6003 =
6. 6.8380 − 5831 =
7. 7.2888 + 1300 =
8. 8.8168 − 3504 =
9. 9.3422 + 2217 =
10. 10.3660 + 4012 =
11. 11.4271 − 1843 =
12. 12.4399 − 1732 =
13. 13.5709 + 4728 =
14. 14.5262 − 1489 =
15. 15.4584 + 7236 =
16. 16.7798 − 7729 =
17. 17.2206 − 1633 =
18. 18.5190 + 1236 =
19. 19.1186 + 3127 =
20. 20.7767 − 4220 =
21. 21.7001 + 8052 =
22. 22.3510 + 1153 =
23. 23.7329 − 2670 =
24. 24.7308 − 5158 =
25. 25.2236 + 4012 =
26. 26.7048 + 8690 =
27. 27.8414 − 1147 =
28. 28.5002 + 5264 =
29. 29.6498 − 1103 =
30. 30.7877 + 5414 =
31. 31.7456 + 5791 =
32. 32.8870 + 2158 =
33. 33.5019 + 7139 =
34. 34.5880 + 3341 =
35. 35.7095 + 2550 =
36. 36.3433 − 1247 =
37. 37.7578 − 7094 =
38. 38.5432 + 8586 =
39. 39.2486 − 2089 =
40. 40.5665 − 4576 =

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