4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 171 · 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. 1.7083 − 4827 =
2. 2.8439 + 5969 =
3. 3.3174 − 1510 =
4. 4.7559 − 1766 =
5. 5.8161 − 3878 =
6. 6.1332 + 4014 =
7. 7.3811 + 2923 =
8. 8.2530 + 4906 =
9. 9.2510 + 8088 =
10. 10.5648 − 2368 =
11. 11.6609 + 7230 =
12. 12.5819 − 5635 =
13. 13.2539 + 7890 =
14. 14.5012 − 1757 =
15. 15.7386 − 1414 =
16. 16.6333 − 3174 =
17. 17.7930 − 1261 =
18. 18.7999 + 3827 =
19. 19.7945 + 8791 =
20. 20.4770 + 5366 =
21. 21.7981 + 8185 =
22. 22.3460 + 3083 =
23. 23.3423 + 4211 =
24. 24.8107 − 4634 =
25. 25.8589 − 6896 =
26. 26.8448 − 1155 =
27. 27.2022 + 5595 =
28. 28.7309 − 3032 =
29. 29.2224 + 4818 =
30. 30.6652 + 7124 =
31. 31.4659 + 3683 =
32. 32.1760 + 5292 =
33. 33.8953 + 8344 =
34. 34.5704 + 5287 =
35. 35.1956 + 3722 =
36. 36.5012 − 4554 =
37. 37.3857 − 1925 =
38. 38.6785 + 7839 =
39. 39.6986 + 8341 =
40. 40.2028 + 2812 =

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