4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 183 · 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. 1.5450 + 2454 =
2. 2.5634 + 5574 =
3. 3.2868 + 6904 =
4. 4.7796 + 7093 =
5. 5.6732 + 7836 =
6. 6.7662 + 4804 =
7. 7.5406 − 3191 =
8. 8.7619 − 2404 =
9. 9.8125 − 6318 =
10. 10.4697 − 3138 =
11. 11.6168 + 7585 =
12. 12.8801 + 5650 =
13. 13.6411 − 2562 =
14. 14.2253 + 6719 =
15. 15.3454 + 3844 =
16. 16.6088 − 4401 =
17. 17.7902 − 2288 =
18. 18.7899 − 2836 =
19. 19.8553 + 3968 =
20. 20.4572 + 5343 =
21. 21.4851 + 6187 =
22. 22.6420 + 4936 =
23. 23.3102 + 4539 =
24. 24.3167 − 1610 =
25. 25.5111 + 8642 =
26. 26.3884 + 2686 =
27. 27.7905 − 5237 =
28. 28.8364 − 3372 =
29. 29.3073 + 4728 =
30. 30.2995 − 1838 =
31. 31.6609 − 2706 =
32. 32.6109 − 4365 =
33. 33.7453 + 6265 =
34. 34.8173 − 2037 =
35. 35.8385 − 7806 =
36. 36.8266 + 3085 =
37. 37.1445 + 8434 =
38. 38.1650 − 1379 =
39. 39.6398 + 1263 =
40. 40.4378 + 8117 =

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