4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 25 · 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. 1.4547 + 6740 =
2. 2.3044 + 8008 =
3. 3.7811 − 1329 =
4. 4.2693 + 2813 =
5. 5.7684 − 5547 =
6. 6.7616 − 1856 =
7. 7.8034 + 3820 =
8. 8.7443 − 7354 =
9. 9.6444 + 5282 =
10. 10.4850 − 2874 =
11. 11.7132 + 2830 =
12. 12.5346 + 6056 =
13. 13.3734 − 2281 =
14. 14.6392 − 1840 =
15. 15.4732 − 4248 =
16. 16.6144 + 6851 =
17. 17.4361 − 3087 =
18. 18.3882 + 4486 =
19. 19.6832 − 4992 =
20. 20.3343 + 8227 =
21. 21.3326 + 8491 =
22. 22.4199 + 5068 =
23. 23.8084 + 3797 =
24. 24.5206 + 7344 =
25. 25.7800 − 6441 =
26. 26.5804 + 7140 =
27. 27.5827 − 1994 =
28. 28.4338 − 2768 =
29. 29.4747 + 8209 =
30. 30.6266 − 1771 =
31. 31.2845 − 1835 =
32. 32.2269 + 4602 =
33. 33.8886 − 7815 =
34. 34.8072 + 7711 =
35. 35.3934 + 7349 =
36. 36.7330 − 6420 =
37. 37.7475 − 1807 =
38. 38.8228 − 6927 =
39. 39.4442 + 3241 =
40. 40.4001 + 4600 =

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