4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 137 · 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. 1.7621 − 3771 =
2. 2.8884 − 4439 =
3. 3.5702 − 3933 =
4. 4.4167 + 6874 =
5. 5.1254 + 3697 =
6. 6.7085 + 1913 =
7. 7.6628 + 3751 =
8. 8.7743 − 4579 =
9. 9.8766 + 2460 =
10. 10.8389 − 1106 =
11. 11.8031 − 6165 =
12. 12.6651 − 6539 =
13. 13.5506 − 5329 =
14. 14.3248 + 5972 =
15. 15.5944 − 2779 =
16. 16.3109 + 7629 =
17. 17.7616 − 2797 =
18. 18.4801 − 1271 =
19. 19.6304 + 3389 =
20. 20.2786 − 2351 =
21. 21.7219 − 4470 =
22. 22.4365 + 1100 =
23. 23.6795 − 2669 =
24. 24.8508 − 1983 =
25. 25.6672 + 7204 =
26. 26.8311 + 7192 =
27. 27.7594 − 3675 =
28. 28.4507 + 5354 =
29. 29.8335 − 3566 =
30. 30.1627 + 8272 =
31. 31.8651 + 4042 =
32. 32.6308 + 8027 =
33. 33.3633 − 3229 =
34. 34.2037 − 1467 =
35. 35.3257 + 7398 =
36. 36.2355 − 1422 =
37. 37.6055 − 4881 =
38. 38.6198 + 1827 =
39. 39.3726 + 3022 =
40. 40.7028 + 3616 =

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths