4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 166 · 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. 1.5636 + 7478 =
2. 2.8951 − 8565 =
3. 3.6229 + 7780 =
4. 4.6992 − 2661 =
5. 5.5792 + 2472 =
6. 6.3674 + 4418 =
7. 7.4687 − 4501 =
8. 8.2731 + 4584 =
9. 9.4482 + 7420 =
10. 10.3969 + 6392 =
11. 11.5879 − 3120 =
12. 12.2197 + 5306 =
13. 13.2754 + 4449 =
14. 14.7181 + 7002 =
15. 15.7765 − 1393 =
16. 16.5876 + 5334 =
17. 17.2649 + 2177 =
18. 18.7628 − 3638 =
19. 19.1664 + 5752 =
20. 20.8928 − 2056 =
21. 21.2125 + 5244 =
22. 22.2619 − 1913 =
23. 23.4681 + 7897 =
24. 24.8664 − 8286 =
25. 25.4324 − 2030 =
26. 26.7207 + 2988 =
27. 27.6737 + 8866 =
28. 28.6168 − 4683 =
29. 29.4541 − 2713 =
30. 30.5950 − 2656 =
31. 31.5287 + 8836 =
32. 32.2367 + 4560 =
33. 33.5327 + 7032 =
34. 34.6556 − 2497 =
35. 35.6057 − 2650 =
36. 36.3153 + 3307 =
37. 37.3842 + 2015 =
38. 38.5065 + 6024 =
39. 39.5748 + 5503 =
40. 40.6262 − 4481 =

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