4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 116 · 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. 1.6131 − 5734 =
2. 2.7972 − 1459 =
3. 3.8517 + 8768 =
4. 4.6428 − 2942 =
5. 5.7626 − 3193 =
6. 6.6470 − 5392 =
7. 7.5651 + 1716 =
8. 8.4102 + 7708 =
9. 9.5800 + 7977 =
10. 10.6117 − 3999 =
11. 11.2170 − 1282 =
12. 12.3984 + 5913 =
13. 13.1599 + 5222 =
14. 14.2754 + 5405 =
15. 15.8685 + 1551 =
16. 16.8447 + 8780 =
17. 17.3485 + 3226 =
18. 18.8604 − 8065 =
19. 19.4080 − 2904 =
20. 20.8246 − 7025 =
21. 21.5271 + 5475 =
22. 22.3182 + 5857 =
23. 23.8895 + 3405 =
24. 24.1133 + 4595 =
25. 25.5400 + 2412 =
26. 26.4904 + 8827 =
27. 27.8171 − 6690 =
28. 28.2708 − 1367 =
29. 29.1655 + 1654 =
30. 30.8150 − 4466 =
31. 31.4025 − 2238 =
32. 32.7228 − 1631 =
33. 33.5892 + 5841 =
34. 34.7386 − 1981 =
35. 35.3373 + 3962 =
36. 36.2164 + 6825 =
37. 37.4746 + 2073 =
38. 38.8262 + 1408 =
39. 39.5739 + 4666 =
40. 40.8377 − 2178 =

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