4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 203 · 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. 1.3442 − 2851 =
2. 2.8158 − 2965 =
3. 3.7061 − 2651 =
4. 4.3789 + 1220 =
5. 5.3836 + 8511 =
6. 6.4292 − 1408 =
7. 7.8762 − 2043 =
8. 8.6142 + 4645 =
9. 9.3998 − 2035 =
10. 10.8904 + 8088 =
11. 11.7108 − 2102 =
12. 12.6214 + 6765 =
13. 13.7575 − 2064 =
14. 14.6952 + 3454 =
15. 15.3759 − 3668 =
16. 16.2769 + 8820 =
17. 17.8256 − 8229 =
18. 18.6049 − 1299 =
19. 19.7569 − 3439 =
20. 20.8661 − 2713 =
21. 21.1205 + 1191 =
22. 22.5602 + 3307 =
23. 23.1924 + 2474 =
24. 24.3138 − 1762 =
25. 25.1292 + 7327 =
26. 26.5901 + 4799 =
27. 27.3039 − 1209 =
28. 28.6981 − 2707 =
29. 29.3878 + 3622 =
30. 30.6915 + 6387 =
31. 31.8517 + 4868 =
32. 32.8930 + 7301 =
33. 33.5340 + 3090 =
34. 34.7588 + 7460 =
35. 35.4474 − 3183 =
36. 36.2499 − 2366 =
37. 37.3156 − 2685 =
38. 38.6643 − 5141 =
39. 39.2681 − 2421 =
40. 40.1668 + 3226 =

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