4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 127 · 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. 1.6542 − 4081 =
2. 2.4787 − 4465 =
3. 3.6793 + 5296 =
4. 4.8498 + 3654 =
5. 5.7057 − 4842 =
6. 6.8302 − 7252 =
7. 7.6000 + 1129 =
8. 8.2650 + 4272 =
9. 9.6569 − 1606 =
10. 10.4814 + 2288 =
11. 11.2530 − 1933 =
12. 12.7238 + 2277 =
13. 13.1488 + 4191 =
14. 14.3464 − 2799 =
15. 15.7780 − 3418 =
16. 16.5381 + 6350 =
17. 17.2798 + 4675 =
18. 18.3775 + 7831 =
19. 19.3399 + 4165 =
20. 20.6762 + 7132 =
21. 21.7806 + 8413 =
22. 22.2533 + 4375 =
23. 23.5266 − 4607 =
24. 24.8598 − 6917 =
25. 25.1703 + 3121 =
26. 26.2186 + 1365 =
27. 27.7278 + 1591 =
28. 28.2881 − 1459 =
29. 29.5878 − 2070 =
30. 30.1808 + 5377 =
31. 31.2511 + 3894 =
32. 32.4292 − 1481 =
33. 33.6674 + 6774 =
34. 34.5452 + 8640 =
35. 35.5025 + 7409 =
36. 36.3926 + 2353 =
37. 37.6914 + 2099 =
38. 38.4316 − 2695 =
39. 39.3544 − 3378 =
40. 40.6085 − 5904 =

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