4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 189 · 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. 1.3740 + 7672 =
2. 2.6249 + 6126 =
3. 3.8006 + 5663 =
4. 4.3503 + 3207 =
5. 5.1838 − 1697 =
6. 6.7152 + 8966 =
7. 7.3253 − 1159 =
8. 8.5633 + 6777 =
9. 9.2788 − 2018 =
10. 10.6824 − 3278 =
11. 11.7397 − 3973 =
12. 12.2083 + 5740 =
13. 13.2702 + 5280 =
14. 14.7260 − 1232 =
15. 15.7606 − 6450 =
16. 16.5712 + 2964 =
17. 17.4174 + 7495 =
18. 18.8827 + 4288 =
19. 19.7415 − 6222 =
20. 20.8774 − 2910 =
21. 21.3795 + 4721 =
22. 22.6590 − 6310 =
23. 23.7446 − 2982 =
24. 24.1185 + 2867 =
25. 25.8055 + 8134 =
26. 26.8109 − 3025 =
27. 27.2086 + 3064 =
28. 28.4130 + 3165 =
29. 29.7069 − 6213 =
30. 30.2227 + 3735 =
31. 31.8643 − 1359 =
32. 32.2952 + 6236 =
33. 33.8076 − 2567 =
34. 34.2691 + 3923 =
35. 35.1953 + 4137 =
36. 36.3934 − 3063 =
37. 37.7817 − 3021 =
38. 38.6087 − 3263 =
39. 39.8152 − 2895 =
40. 40.3833 + 6817 =

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