4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 79 · 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. 1.6040 − 1835 =
2. 2.5405 − 1728 =
3. 3.3271 − 1490 =
4. 4.1974 + 3104 =
5. 5.8253 − 3091 =
6. 6.7333 − 2756 =
7. 7.7363 − 1748 =
8. 8.4153 + 7268 =
9. 9.5774 + 1885 =
10. 10.1124 + 6090 =
11. 11.5750 − 4638 =
12. 12.6095 + 8742 =
13. 13.3159 + 8344 =
14. 14.3141 − 2430 =
15. 15.1145 + 1994 =
16. 16.7444 − 1162 =
17. 17.3072 − 1266 =
18. 18.5911 + 7505 =
19. 19.5316 + 3842 =
20. 20.2801 + 2015 =
21. 21.8473 − 4088 =
22. 22.8700 − 4703 =
23. 23.8276 + 2264 =
24. 24.1153 + 1555 =
25. 25.6620 − 5402 =
26. 26.4994 + 4924 =
27. 27.8751 − 7654 =
28. 28.4943 + 6621 =
29. 29.4246 + 1585 =
30. 30.6168 − 5945 =
31. 31.6057 + 1472 =
32. 32.4536 − 4396 =
33. 33.8161 − 1183 =
34. 34.5819 − 2986 =
35. 35.3163 + 2555 =
36. 36.2817 + 6760 =
37. 37.7324 − 2927 =
38. 38.2468 − 2192 =
39. 39.5690 − 1919 =
40. 40.5523 + 8863 =

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