4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 209 · 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. 1.7906 + 3015 =
2. 2.6450 + 3319 =
3. 3.4540 + 8897 =
4. 4.5029 + 3564 =
5. 5.3549 + 5943 =
6. 6.1919 − 1506 =
7. 7.2601 + 6095 =
8. 8.6126 − 2370 =
9. 9.8602 + 5294 =
10. 10.3906 + 8128 =
11. 11.6160 + 3653 =
12. 12.6483 + 7104 =
13. 13.7827 − 5574 =
14. 14.2441 + 8221 =
15. 15.8097 + 7032 =
16. 16.6169 − 1529 =
17. 17.6778 − 6346 =
18. 18.4164 + 3558 =
19. 19.5845 − 5792 =
20. 20.8299 − 7377 =
21. 21.4097 + 5271 =
22. 22.2325 + 6582 =
23. 23.4085 + 1643 =
24. 24.6818 + 3026 =
25. 25.4898 + 1624 =
26. 26.6428 − 2156 =
27. 27.4306 − 3496 =
28. 28.1333 − 1315 =
29. 29.5677 + 3039 =
30. 30.1299 + 6343 =
31. 31.4988 + 6426 =
32. 32.2241 − 1339 =
33. 33.8942 + 3522 =
34. 34.7623 + 2415 =
35. 35.5551 + 8027 =
36. 36.7544 + 8270 =
37. 37.8063 − 5445 =
38. 38.2631 + 1541 =
39. 39.6686 − 1698 =
40. 40.6235 + 3391 =

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