4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 11 · 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. 1.3338 + 6994 =
2. 2.4573 + 2215 =
3. 3.3823 + 8220 =
4. 4.2777 − 1918 =
5. 5.5842 + 3477 =
6. 6.4686 + 1617 =
7. 7.6885 − 2072 =
8. 8.7112 − 3907 =
9. 9.1459 + 3511 =
10. 10.4030 + 3061 =
11. 11.5077 − 4659 =
12. 12.6799 + 8110 =
13. 13.7426 + 2649 =
14. 14.8737 − 3603 =
15. 15.3213 + 1256 =
16. 16.8006 + 6821 =
17. 17.3695 + 3096 =
18. 18.8995 − 1433 =
19. 19.8606 − 3907 =
20. 20.2921 − 2832 =
21. 21.5840 + 6643 =
22. 22.1605 + 1975 =
23. 23.8569 + 3608 =
24. 24.8451 + 3553 =
25. 25.8613 − 1682 =
26. 26.6560 − 3336 =
27. 27.8127 + 8671 =
28. 28.4160 + 1474 =
29. 29.3433 + 3759 =
30. 30.2653 − 1297 =
31. 31.4003 + 3756 =
32. 32.7144 − 6690 =
33. 33.3659 + 4260 =
34. 34.4164 + 4994 =
35. 35.7002 − 3316 =
36. 36.7988 − 1813 =
37. 37.3648 − 3351 =
38. 38.7666 − 6429 =
39. 39.7070 − 4325 =
40. 40.2590 − 2319 =

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