4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 34 · 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. 1.6865 + 8407 =
2. 2.6997 − 6531 =
3. 3.5835 − 2663 =
4. 4.8481 + 1457 =
5. 5.3581 + 5598 =
6. 6.4452 − 4336 =
7. 7.4323 + 5120 =
8. 8.2921 + 1845 =
9. 9.8804 − 1535 =
10. 10.1796 + 7818 =
11. 11.5937 + 5615 =
12. 12.3926 + 3159 =
13. 13.4788 − 3777 =
14. 14.5851 + 5137 =
15. 15.5086 + 1710 =
16. 16.1618 + 6600 =
17. 17.7358 − 6105 =
18. 18.3773 + 5754 =
19. 19.7265 − 2732 =
20. 20.6980 − 6791 =
21. 21.8711 − 8274 =
22. 22.6600 − 5358 =
23. 23.8071 − 7449 =
24. 24.4922 + 7965 =
25. 25.8594 + 1857 =
26. 26.6839 − 2444 =
27. 27.2941 + 5811 =
28. 28.8309 + 2693 =
29. 29.5017 − 3833 =
30. 30.8806 + 2194 =
31. 31.5195 − 4571 =
32. 32.6444 − 4974 =
33. 33.4145 + 8804 =
34. 34.7588 − 5799 =
35. 35.3162 + 3274 =
36. 36.5055 − 3020 =
37. 37.8861 − 7267 =
38. 38.5191 + 6565 =
39. 39.3309 + 5616 =
40. 40.6572 − 3211 =

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