4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 105 · 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. 1.2270 + 7018 =
2. 2.7169 + 1128 =
3. 3.3050 + 1154 =
4. 4.5650 + 2778 =
5. 5.8768 − 8268 =
6. 6.5723 − 3613 =
7. 7.5720 − 4106 =
8. 8.8080 + 2924 =
9. 9.8099 − 8051 =
10. 10.8215 + 6578 =
11. 11.4448 + 4424 =
12. 12.7163 − 1311 =
13. 13.1698 + 4847 =
14. 14.5179 + 3706 =
15. 15.7118 + 1197 =
16. 16.3029 − 2268 =
17. 17.3008 − 1835 =
18. 18.7623 + 5941 =
19. 19.8279 − 1755 =
20. 20.7878 + 6516 =
21. 21.2640 + 5230 =
22. 22.7507 − 2848 =
23. 23.6492 + 4435 =
24. 24.1521 + 4076 =
25. 25.4233 + 8066 =
26. 26.8777 + 5028 =
27. 27.6372 − 3179 =
28. 28.5015 + 6522 =
29. 29.7639 + 1256 =
30. 30.8859 − 6773 =
31. 31.4936 + 4204 =
32. 32.6649 − 6214 =
33. 33.6908 + 5623 =
34. 34.4636 + 5878 =
35. 35.1423 + 2229 =
36. 36.4964 − 2796 =
37. 37.2141 + 2796 =
38. 38.6959 − 5138 =
39. 39.7333 − 2663 =
40. 40.7667 + 7856 =

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