4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 22 · 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. 1.4728 − 3670 =
2. 2.5454 − 1329 =
3. 3.1266 + 5501 =
4. 4.7184 + 6212 =
5. 5.7338 + 2246 =
6. 6.2330 + 3173 =
7. 7.2921 − 2610 =
8. 8.2447 − 1789 =
9. 9.1962 − 1891 =
10. 10.6525 − 6372 =
11. 11.8306 + 6160 =
12. 12.8216 − 1652 =
13. 13.8019 − 2833 =
14. 14.6390 + 1814 =
15. 15.3120 + 7114 =
16. 16.7810 + 2336 =
17. 17.7974 − 6736 =
18. 18.6861 − 6748 =
19. 19.4956 − 4436 =
20. 20.8219 − 2088 =
21. 21.2738 + 6089 =
22. 22.6573 + 5786 =
23. 23.7977 − 6816 =
24. 24.2985 + 1119 =
25. 25.8330 + 2883 =
26. 26.5704 − 2126 =
27. 27.8190 − 7155 =
28. 28.4735 + 8016 =
29. 29.6869 − 3698 =
30. 30.3553 − 2965 =
31. 31.8769 + 1935 =
32. 32.6836 + 2324 =
33. 33.7482 + 2160 =
34. 34.5330 + 7463 =
35. 35.2446 − 2409 =
36. 36.4850 − 2894 =
37. 37.5178 − 4283 =
38. 38.6616 + 6017 =
39. 39.1486 + 5583 =
40. 40.8104 − 7680 =

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