4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 146 · 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. 1.1586 + 8392 =
2. 2.3980 − 3821 =
3. 3.1860 − 1853 =
4. 4.2765 + 8091 =
5. 5.5459 + 8711 =
6. 6.5918 − 2636 =
7. 7.2410 + 8520 =
8. 8.7585 − 1257 =
9. 9.1617 + 1962 =
10. 10.5498 − 1727 =
11. 11.4743 − 1923 =
12. 12.3325 − 1339 =
13. 13.4780 + 5799 =
14. 14.6449 − 5329 =
15. 15.3159 + 7044 =
16. 16.6704 − 3852 =
17. 17.2528 + 4051 =
18. 18.2588 + 2077 =
19. 19.4961 + 1303 =
20. 20.6348 + 8480 =
21. 21.5989 − 3144 =
22. 22.6526 + 6250 =
23. 23.3137 + 6818 =
24. 24.8780 + 1145 =
25. 25.4049 − 2993 =
26. 26.4323 − 3055 =
27. 27.3689 − 2935 =
28. 28.7273 − 6049 =
29. 29.6255 − 2483 =
30. 30.1476 + 2016 =
31. 31.4368 − 2337 =
32. 32.4525 + 2760 =
33. 33.4794 + 5071 =
34. 34.8795 + 8670 =
35. 35.2219 + 6655 =
36. 36.6549 − 3463 =
37. 37.8942 − 7656 =
38. 38.8669 − 4906 =
39. 39.8815 − 7968 =
40. 40.7518 + 5374 =

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