4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 167 · 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. 1.5416 + 3857 =
2. 2.8567 − 1395 =
3. 3.8033 − 3272 =
4. 4.3378 − 2439 =
5. 5.7088 − 4196 =
6. 6.8126 − 6127 =
7. 7.7698 − 4740 =
8. 8.3442 − 2033 =
9. 9.1587 + 5657 =
10. 10.3252 − 2681 =
11. 11.8103 − 6451 =
12. 12.6922 − 6702 =
13. 13.3638 − 3397 =
14. 14.2636 + 5057 =
15. 15.7621 − 2889 =
16. 16.1740 + 2068 =
17. 17.7628 − 5461 =
18. 18.1707 + 6769 =
19. 19.7095 − 5204 =
20. 20.5052 + 2310 =
21. 21.3040 − 1798 =
22. 22.1326 + 7311 =
23. 23.4264 + 4203 =
24. 24.5929 + 7149 =
25. 25.7530 − 2964 =
26. 26.4803 + 5464 =
27. 27.5018 − 2332 =
28. 28.3233 − 2948 =
29. 29.8312 + 2940 =
30. 30.2403 + 5527 =
31. 31.3499 + 1968 =
32. 32.6543 + 6093 =
33. 33.5265 − 2086 =
34. 34.2031 + 8701 =
35. 35.2761 + 3656 =
36. 36.8630 + 6324 =
37. 37.8512 − 5565 =
38. 38.1337 + 6986 =
39. 39.7865 + 3552 =
40. 40.3327 + 7433 =

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