4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 199 · 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. 1.2095 + 8208 =
2. 2.4998 − 2235 =
3. 3.5218 − 2907 =
4. 4.4239 + 6298 =
5. 5.6909 − 2180 =
6. 6.8986 − 6033 =
7. 7.2630 + 2740 =
8. 8.8541 + 6199 =
9. 9.4785 + 7513 =
10. 10.4627 + 2958 =
11. 11.7756 − 2024 =
12. 12.3290 + 7943 =
13. 13.5599 + 4310 =
14. 14.7708 − 5552 =
15. 15.7619 − 7042 =
16. 16.2877 − 1375 =
17. 17.8507 − 5594 =
18. 18.5938 − 4922 =
19. 19.5990 − 1136 =
20. 20.7174 + 3897 =
21. 21.7511 − 3354 =
22. 22.5115 − 1717 =
23. 23.6528 − 4219 =
24. 24.6735 + 7776 =
25. 25.8516 − 5366 =
26. 26.7337 − 5925 =
27. 27.5792 + 1360 =
28. 28.7543 + 5373 =
29. 29.7662 + 4356 =
30. 30.1374 + 3369 =
31. 31.2000 + 5811 =
32. 32.8006 − 2980 =
33. 33.5877 − 4000 =
34. 34.8298 + 5571 =
35. 35.6925 + 7562 =
36. 36.8412 − 5053 =
37. 37.2926 + 5809 =
38. 38.8548 + 2244 =
39. 39.6849 − 1996 =
40. 40.1221 + 1319 =

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