4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 121 · 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. 1.2237 + 3047 =
2. 2.3517 + 1694 =
3. 3.7760 + 2353 =
4. 4.8906 − 6423 =
5. 5.8017 − 2767 =
6. 6.7057 − 6189 =
7. 7.4062 − 3059 =
8. 8.3509 + 1516 =
9. 9.7216 − 6747 =
10. 10.8023 − 2892 =
11. 11.7520 − 5587 =
12. 12.8411 + 4930 =
13. 13.8497 + 1820 =
14. 14.8442 − 7395 =
15. 15.8093 − 4970 =
16. 16.4221 + 5276 =
17. 17.7927 + 5007 =
18. 18.8717 − 4167 =
19. 19.4991 − 1441 =
20. 20.7398 + 1153 =
21. 21.7668 + 3414 =
22. 22.4135 − 2430 =
23. 23.7656 + 5292 =
24. 24.5015 − 4100 =
25. 25.1738 − 1174 =
26. 26.1813 + 8329 =
27. 27.4431 + 6158 =
28. 28.8204 − 6878 =
29. 29.6393 − 3339 =
30. 30.5517 + 8476 =
31. 31.2509 − 1521 =
32. 32.4438 + 6195 =
33. 33.8975 − 3442 =
34. 34.7114 − 3186 =
35. 35.5591 − 1740 =
36. 36.5766 − 5368 =
37. 37.7628 − 6636 =
38. 38.7851 + 3462 =
39. 39.1993 + 4489 =
40. 40.8453 + 7702 =

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