4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 180 · 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. 1.6521 − 3829 =
2. 2.6428 − 2015 =
3. 3.3310 − 3246 =
4. 4.2189 + 8039 =
5. 5.4267 + 8030 =
6. 6.7324 − 1483 =
7. 7.6437 − 1704 =
8. 8.7492 − 7037 =
9. 9.1294 + 7525 =
10. 10.4965 + 8659 =
11. 11.3816 + 4512 =
12. 12.8067 − 1169 =
13. 13.1467 + 3398 =
14. 14.7642 + 3632 =
15. 15.1861 + 3224 =
16. 16.3359 + 7122 =
17. 17.6774 − 3647 =
18. 18.5043 + 5490 =
19. 19.2329 + 6991 =
20. 20.8235 − 4423 =
21. 21.8203 + 1364 =
22. 22.1211 + 2287 =
23. 23.6286 − 3647 =
24. 24.4786 + 1504 =
25. 25.2376 + 5485 =
26. 26.3706 − 3415 =
27. 27.7864 + 4535 =
28. 28.6012 − 4451 =
29. 29.7789 − 6692 =
30. 30.6304 − 3323 =
31. 31.1120 + 5068 =
32. 32.8224 − 1979 =
33. 33.7090 + 4371 =
34. 34.2693 − 1157 =
35. 35.8197 + 2247 =
36. 36.3685 − 2784 =
37. 37.2722 − 1247 =
38. 38.2452 + 5495 =
39. 39.3793 − 1347 =
40. 40.8703 + 8402 =

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