4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 78 · 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. 1.1919 − 1369 =
2. 2.6641 − 4722 =
3. 3.7765 − 2452 =
4. 4.1304 + 7258 =
5. 5.3523 − 1625 =
6. 6.1135 + 2613 =
7. 7.4763 − 1363 =
8. 8.6272 + 7793 =
9. 9.7333 − 6966 =
10. 10.6275 − 5900 =
11. 11.8498 − 6996 =
12. 12.5527 − 1944 =
13. 13.5488 + 8656 =
14. 14.7377 − 5817 =
15. 15.2971 + 4245 =
16. 16.7552 − 5333 =
17. 17.6067 − 4752 =
18. 18.8157 + 4726 =
19. 19.6929 − 6093 =
20. 20.8466 + 3577 =
21. 21.5856 − 3694 =
22. 22.2685 + 7504 =
23. 23.8489 − 6881 =
24. 24.7551 + 5466 =
25. 25.5246 + 6369 =
26. 26.5175 − 1465 =
27. 27.1544 + 7589 =
28. 28.4750 − 1720 =
29. 29.7416 − 1324 =
30. 30.6602 + 1908 =
31. 31.1849 + 5502 =
32. 32.2584 + 8593 =
33. 33.8442 − 6570 =
34. 34.6166 − 2793 =
35. 35.1821 + 3184 =
36. 36.3092 + 7262 =
37. 37.6606 − 2915 =
38. 38.8189 + 7095 =
39. 39.3902 − 1833 =
40. 40.8659 − 8232 =

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