4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 54 · 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. 1.8031 + 5553 =
2. 2.6557 + 4187 =
3. 3.6558 − 2028 =
4. 4.5789 − 3118 =
5. 5.6490 − 6421 =
6. 6.1440 + 3036 =
7. 7.4383 + 8754 =
8. 8.7666 − 6166 =
9. 9.1889 + 4512 =
10. 10.6894 − 3341 =
11. 11.2458 + 7487 =
12. 12.8927 − 6681 =
13. 13.1865 − 1771 =
14. 14.5773 − 1880 =
15. 15.5176 + 1422 =
16. 16.4368 − 2862 =
17. 17.8406 − 5473 =
18. 18.2275 − 1692 =
19. 19.1756 + 6069 =
20. 20.8135 − 3391 =
21. 21.5113 + 2482 =
22. 22.8294 − 1352 =
23. 23.6018 − 5792 =
24. 24.3072 − 2490 =
25. 25.5422 + 8817 =
26. 26.2085 − 1994 =
27. 27.5313 + 4780 =
28. 28.6823 − 2207 =
29. 29.2045 + 2943 =
30. 30.8430 − 2000 =
31. 31.6294 + 6897 =
32. 32.2073 − 1580 =
33. 33.7345 − 1189 =
34. 34.2878 + 8147 =
35. 35.7340 + 3604 =
36. 36.5993 + 6986 =
37. 37.3481 − 2066 =
38. 38.6380 − 3182 =
39. 39.6339 − 3426 =
40. 40.7742 − 1608 =

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