4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 179 · 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. 1.3784 − 2925 =
2. 2.3147 + 2165 =
3. 3.7592 + 8749 =
4. 4.6484 + 7730 =
5. 5.6410 + 1387 =
6. 6.3401 − 1635 =
7. 7.4436 + 4232 =
8. 8.5578 + 5861 =
9. 9.3472 + 7900 =
10. 10.7252 + 2710 =
11. 11.6638 − 1991 =
12. 12.6224 − 6190 =
13. 13.2764 + 1336 =
14. 14.2789 − 2383 =
15. 15.1998 − 1356 =
16. 16.8656 − 5219 =
17. 17.2068 + 4648 =
18. 18.8798 − 6601 =
19. 19.7274 − 1766 =
20. 20.3573 − 3186 =
21. 21.8310 + 2425 =
22. 22.6931 + 4087 =
23. 23.4891 − 3624 =
24. 24.2769 + 5909 =
25. 25.2688 + 5637 =
26. 26.8691 + 2475 =
27. 27.6382 − 4667 =
28. 28.1792 − 1385 =
29. 29.6440 − 6164 =
30. 30.1856 − 1275 =
31. 31.8614 − 6375 =
32. 32.1464 + 7609 =
33. 33.4885 − 3370 =
34. 34.6244 + 4130 =
35. 35.6210 − 4336 =
36. 36.2907 + 1720 =
37. 37.1658 − 1432 =
38. 38.8725 − 2399 =
39. 39.2529 − 1621 =
40. 40.8701 − 6175 =

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