4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 151 · 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. 1.7706 + 1911 =
2. 2.7379 − 2102 =
3. 3.3212 + 5949 =
4. 4.2638 + 4440 =
5. 5.3754 + 5441 =
6. 6.5439 − 3179 =
7. 7.5894 − 4120 =
8. 8.5226 − 2396 =
9. 9.6495 − 6226 =
10. 10.3746 − 1798 =
11. 11.8835 + 4896 =
12. 12.3916 + 8014 =
13. 13.5218 + 5251 =
14. 14.4589 + 8807 =
15. 15.1414 + 5876 =
16. 16.6206 − 5561 =
17. 17.6339 − 1248 =
18. 18.1836 + 6300 =
19. 19.5094 − 3433 =
20. 20.7212 − 7069 =
21. 21.2984 + 3709 =
22. 22.7610 − 2201 =
23. 23.4530 + 3263 =
24. 24.2727 + 2780 =
25. 25.8278 − 2348 =
26. 26.1455 − 1251 =
27. 27.6683 + 8777 =
28. 28.4613 + 2522 =
29. 29.7760 − 4984 =
30. 30.2134 − 1682 =
31. 31.2875 + 7749 =
32. 32.5828 − 3102 =
33. 33.7308 + 6703 =
34. 34.2808 − 2015 =
35. 35.8929 − 4551 =
36. 36.6627 − 5692 =
37. 37.3595 + 6706 =
38. 38.8947 + 4145 =
39. 39.7014 + 2022 =
40. 40.2984 + 8019 =

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