4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 117 · 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. 1.4589 − 3306 =
2. 2.4678 − 1841 =
3. 3.3104 − 1386 =
4. 4.2291 + 1640 =
5. 5.5598 + 6747 =
6. 6.6805 − 3150 =
7. 7.7099 + 1322 =
8. 8.8261 − 2986 =
9. 9.2152 + 2914 =
10. 10.6976 − 2424 =
11. 11.8919 − 2489 =
12. 12.1572 + 4993 =
13. 13.5660 − 4669 =
14. 14.8209 − 7714 =
15. 15.8749 + 1287 =
16. 16.6697 − 1291 =
17. 17.3710 − 1293 =
18. 18.1107 + 8883 =
19. 19.3020 + 2422 =
20. 20.3731 − 3180 =
21. 21.5116 + 3667 =
22. 22.6301 + 8614 =
23. 23.5973 + 8482 =
24. 24.2818 + 2198 =
25. 25.6707 − 5046 =
26. 26.7646 + 5624 =
27. 27.8729 + 7418 =
28. 28.2230 + 8828 =
29. 29.3801 + 7243 =
30. 30.4278 − 2127 =
31. 31.5578 + 1986 =
32. 32.3036 + 1587 =
33. 33.1205 + 2861 =
34. 34.2223 + 3204 =
35. 35.1980 − 1764 =
36. 36.7514 + 7792 =
37. 37.7902 − 7128 =
38. 38.5721 − 5180 =
39. 39.4674 − 4080 =
40. 40.3617 − 2187 =

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