4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 140 · 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. 1.3469 − 2936 =
2. 2.2072 + 6393 =
3. 3.7447 + 5972 =
4. 4.6201 + 5916 =
5. 5.8107 − 3003 =
6. 6.8725 − 5745 =
7. 7.6646 − 6019 =
8. 8.3700 + 1899 =
9. 9.4442 + 1493 =
10. 10.7870 + 6251 =
11. 11.7156 + 1778 =
12. 12.8663 − 3425 =
13. 13.8440 + 7149 =
14. 14.2148 − 1518 =
15. 15.3301 + 5735 =
16. 16.8138 + 8264 =
17. 17.6270 − 5106 =
18. 18.7974 − 1366 =
19. 19.6125 − 4901 =
20. 20.4503 + 7466 =
21. 21.8739 − 7333 =
22. 22.8306 − 5015 =
23. 23.8928 − 8431 =
24. 24.6040 + 1583 =
25. 25.7778 + 6163 =
26. 26.7034 + 8718 =
27. 27.4116 + 5298 =
28. 28.5149 + 2672 =
29. 29.3447 − 2458 =
30. 30.6631 − 4425 =
31. 31.5328 + 1635 =
32. 32.6228 − 4235 =
33. 33.4099 + 4278 =
34. 34.6878 − 2811 =
35. 35.1151 + 4048 =
36. 36.8893 − 2974 =
37. 37.3943 + 4524 =
38. 38.7978 − 6458 =
39. 39.6089 − 4638 =
40. 40.5323 − 1837 =

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