4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 160 · 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. 1.1829 + 4280 =
2. 2.2146 + 3212 =
3. 3.8131 + 5241 =
4. 4.3248 + 8365 =
5. 5.6436 − 5867 =
6. 6.7131 − 6721 =
7. 7.3916 + 4094 =
8. 8.2430 − 1862 =
9. 9.5368 − 3447 =
10. 10.2068 + 1533 =
11. 11.2630 + 1379 =
12. 12.7304 − 2938 =
13. 13.4097 − 3596 =
14. 14.7553 + 1978 =
15. 15.8241 + 2239 =
16. 16.6595 + 3617 =
17. 17.6358 − 4315 =
18. 18.2260 − 1363 =
19. 19.3183 + 6083 =
20. 20.1781 + 7639 =
21. 21.8359 − 7526 =
22. 22.7931 − 3209 =
23. 23.3742 − 1328 =
24. 24.3121 − 2753 =
25. 25.2822 + 2537 =
26. 26.6913 + 4468 =
27. 27.7822 + 1678 =
28. 28.6414 + 4706 =
29. 29.4946 − 2509 =
30. 30.3065 + 2552 =
31. 31.3953 + 6063 =
32. 32.5870 − 3166 =
33. 33.7828 + 3762 =
34. 34.5755 + 7865 =
35. 35.8760 − 2590 =
36. 36.6672 − 2799 =
37. 37.6328 − 2735 =
38. 38.4027 − 3733 =
39. 39.2954 + 1528 =
40. 40.5320 + 8734 =

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