4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 113 · 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. 1.7428 + 3097 =
2. 2.8834 + 8940 =
3. 3.4088 − 1217 =
4. 4.5341 + 3018 =
5. 5.7713 + 4147 =
6. 6.5972 + 2295 =
7. 7.6983 + 5751 =
8. 8.5977 + 3543 =
9. 9.1614 + 6063 =
10. 10.7279 + 6106 =
11. 11.8036 + 5444 =
12. 12.7552 − 1602 =
13. 13.8090 + 3246 =
14. 14.3062 − 2885 =
15. 15.2932 − 2153 =
16. 16.6709 + 2482 =
17. 17.8032 − 1905 =
18. 18.6759 − 5633 =
19. 19.8494 − 2497 =
20. 20.3034 + 2820 =
21. 21.5074 + 8975 =
22. 22.4113 + 8551 =
23. 23.2212 − 1195 =
24. 24.4571 − 4117 =
25. 25.3289 + 8063 =
26. 26.4403 − 3940 =
27. 27.4677 + 7762 =
28. 28.3747 − 3036 =
29. 29.7794 + 2761 =
30. 30.6094 − 5951 =
31. 31.8615 + 6490 =
32. 32.7713 − 2443 =
33. 33.6019 − 2690 =
34. 34.8369 − 1602 =
35. 35.8526 + 3833 =
36. 36.8325 − 7992 =
37. 37.3497 + 8382 =
38. 38.2329 + 1189 =
39. 39.5379 + 8236 =
40. 40.3769 − 2600 =

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