4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 143 · 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. 1.5309 − 3203 =
2. 2.3171 + 5588 =
3. 3.8132 − 2470 =
4. 4.3181 + 3739 =
5. 5.6512 − 4022 =
6. 6.6572 + 4411 =
7. 7.5484 − 5061 =
8. 8.8505 + 3938 =
9. 9.4920 − 2809 =
10. 10.7050 − 6236 =
11. 11.3870 + 2042 =
12. 12.5193 + 3731 =
13. 13.7038 + 4817 =
14. 14.2428 + 2577 =
15. 15.7919 − 4614 =
16. 16.1244 + 1119 =
17. 17.4947 + 8052 =
18. 18.1633 + 1885 =
19. 19.5937 − 5338 =
20. 20.8220 + 2925 =
21. 21.2415 + 2528 =
22. 22.8743 − 3460 =
23. 23.5100 + 2864 =
24. 24.3948 + 2727 =
25. 25.8713 + 1648 =
26. 26.1490 + 7363 =
27. 27.4228 − 2895 =
28. 28.6608 + 3431 =
29. 29.6882 + 5032 =
30. 30.5738 − 1265 =
31. 31.2939 + 2029 =
32. 32.7707 + 1172 =
33. 33.3161 − 2638 =
34. 34.2819 + 5950 =
35. 35.8932 − 6122 =
36. 36.3657 + 8480 =
37. 37.6681 − 5616 =
38. 38.3229 + 4658 =
39. 39.6307 + 4340 =
40. 40.8556 + 1214 =

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