4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 152 · 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. 1.4582 + 4574 =
2. 2.1300 + 2606 =
3. 3.8760 − 5554 =
4. 4.1126 + 3067 =
5. 5.5523 − 2695 =
6. 6.7362 − 3037 =
7. 7.7772 + 6009 =
8. 8.7528 − 2954 =
9. 9.7152 − 2538 =
10. 10.7819 − 4831 =
11. 11.3315 − 2032 =
12. 12.7734 + 6034 =
13. 13.7204 + 6125 =
14. 14.2669 + 3076 =
15. 15.1747 + 2850 =
16. 16.6740 − 3611 =
17. 17.7517 + 1570 =
18. 18.7799 − 1968 =
19. 19.5304 − 4519 =
20. 20.1116 + 3654 =
21. 21.1530 + 3967 =
22. 22.7377 + 8019 =
23. 23.4922 + 6528 =
24. 24.1324 + 1971 =
25. 25.1970 + 3312 =
26. 26.7942 + 5829 =
27. 27.6903 − 1808 =
28. 28.7544 + 8067 =
29. 29.7998 − 1720 =
30. 30.3087 + 8034 =
31. 31.7956 + 7675 =
32. 32.6891 − 3042 =
33. 33.1739 + 8028 =
34. 34.5784 − 1833 =
35. 35.3411 + 5070 =
36. 36.3058 + 6093 =
37. 37.8747 + 1937 =
38. 38.2746 + 8806 =
39. 39.5898 + 8994 =
40. 40.1958 + 5356 =

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