4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 114 · 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. 1.7170 − 5159 =
2. 2.4588 + 5294 =
3. 3.3012 + 6170 =
4. 4.2752 + 4357 =
5. 5.8267 − 7072 =
6. 6.8461 − 1616 =
7. 7.7205 − 6000 =
8. 8.6211 + 8497 =
9. 9.7882 − 6841 =
10. 10.8488 − 1539 =
11. 11.8125 − 1233 =
12. 12.1747 + 5400 =
13. 13.3983 − 2423 =
14. 14.5339 − 1816 =
15. 15.7810 − 4075 =
16. 16.7648 − 5208 =
17. 17.1759 + 5863 =
18. 18.7157 − 2805 =
19. 19.1631 + 2285 =
20. 20.7822 − 3231 =
21. 21.7271 + 1465 =
22. 22.3581 + 8590 =
23. 23.6843 − 1220 =
24. 24.8819 + 6963 =
25. 25.2859 + 3296 =
26. 26.1592 + 7667 =
27. 27.5656 − 4042 =
28. 28.8961 − 1237 =
29. 29.8519 − 5122 =
30. 30.7407 + 5989 =
31. 31.8123 + 5242 =
32. 32.6974 − 1583 =
33. 33.1362 + 8463 =
34. 34.6576 + 3584 =
35. 35.6274 − 3368 =
36. 36.7733 − 6522 =
37. 37.8740 + 7238 =
38. 38.1374 + 6338 =
39. 39.4246 + 8095 =
40. 40.8451 − 1690 =

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