4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 120 · 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. 1.1480 + 1903 =
2. 2.8585 − 5817 =
3. 3.1624 + 3642 =
4. 4.6092 + 6836 =
5. 5.3583 + 3505 =
6. 6.3604 + 2005 =
7. 7.3197 − 2804 =
8. 8.1408 + 6134 =
9. 9.5754 − 2093 =
10. 10.2879 + 7778 =
11. 11.5167 − 4787 =
12. 12.8001 + 5659 =
13. 13.4671 + 1982 =
14. 14.4119 + 4153 =
15. 15.5323 + 4223 =
16. 16.8963 − 7880 =
17. 17.1935 + 1376 =
18. 18.7177 − 3051 =
19. 19.7855 − 4354 =
20. 20.7557 − 6974 =
21. 21.6783 − 2572 =
22. 22.4229 + 8402 =
23. 23.8859 − 4069 =
24. 24.8414 + 2955 =
25. 25.4355 − 1261 =
26. 26.8110 + 7982 =
27. 27.8173 − 1700 =
28. 28.8059 − 5031 =
29. 29.2414 + 2971 =
30. 30.5583 + 2164 =
31. 31.6568 + 7008 =
32. 32.6067 + 1502 =
33. 33.4096 − 1141 =
34. 34.7369 − 2616 =
35. 35.3618 − 2284 =
36. 36.3420 + 3314 =
37. 37.7359 + 4573 =
38. 38.4912 − 4582 =
39. 39.8332 + 1227 =
40. 40.1698 − 1148 =

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