4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 70 · 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. 1.4847 − 3934 =
2. 2.8733 − 2545 =
3. 3.7886 − 1630 =
4. 4.3266 − 1492 =
5. 5.7796 − 5136 =
6. 6.5875 + 8106 =
7. 7.8377 − 7737 =
8. 8.2328 + 2661 =
9. 9.4479 − 2708 =
10. 10.2722 − 2591 =
11. 11.4538 + 5670 =
12. 12.5154 − 1272 =
13. 13.8939 − 5366 =
14. 14.2890 + 2489 =
15. 15.4795 + 6705 =
16. 16.2853 + 6857 =
17. 17.1982 + 6159 =
18. 18.2556 − 1607 =
19. 19.7969 + 4679 =
20. 20.5500 − 3554 =
21. 21.4359 − 1449 =
22. 22.2008 − 1791 =
23. 23.4256 − 3890 =
24. 24.8032 + 7660 =
25. 25.3637 + 4522 =
26. 26.1791 − 1693 =
27. 27.7242 − 2078 =
28. 28.5766 − 3763 =
29. 29.8793 − 3979 =
30. 30.3621 − 2288 =
31. 31.4543 − 2703 =
32. 32.6284 − 1886 =
33. 33.4720 + 5887 =
34. 34.3598 + 7048 =
35. 35.3849 + 6239 =
36. 36.6456 − 5862 =
37. 37.3000 − 2291 =
38. 38.7254 − 4075 =
39. 39.5052 + 4671 =
40. 40.8321 − 6539 =

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