4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 192 · 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. 1.5359 + 1502 =
2. 2.7678 + 4821 =
3. 3.2620 + 6984 =
4. 4.4081 + 3225 =
5. 5.4899 + 1513 =
6. 6.4643 + 8783 =
7. 7.3335 − 1338 =
8. 8.3440 − 1578 =
9. 9.2698 + 1106 =
10. 10.3292 + 8840 =
11. 11.6808 + 8318 =
12. 12.4810 − 3955 =
13. 13.4295 + 3345 =
14. 14.3271 − 1722 =
15. 15.3298 + 8839 =
16. 16.2237 + 6728 =
17. 17.8512 − 3333 =
18. 18.5565 − 1742 =
19. 19.6249 − 1319 =
20. 20.6032 + 5438 =
21. 21.5683 − 2909 =
22. 22.2125 − 1783 =
23. 23.5763 + 6056 =
24. 24.6006 + 1456 =
25. 25.8645 − 2004 =
26. 26.6039 + 8222 =
27. 27.6190 − 1501 =
28. 28.2865 + 8252 =
29. 29.5378 − 4159 =
30. 30.6570 + 4794 =
31. 31.5730 + 1409 =
32. 32.7785 − 6449 =
33. 33.2996 − 1535 =
34. 34.8807 − 1657 =
35. 35.8731 − 3509 =
36. 36.7739 − 7393 =
37. 37.6174 + 7983 =
38. 38.8237 − 1356 =
39. 39.6473 − 6053 =
40. 40.7935 − 2015 =

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