4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 193 · 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. 1.7931 − 5969 =
2. 2.8143 + 3927 =
3. 3.3324 − 1393 =
4. 4.7978 − 2251 =
5. 5.6191 + 5080 =
6. 6.7862 − 5462 =
7. 7.7525 − 4797 =
8. 8.1843 + 2630 =
9. 9.5277 + 5497 =
10. 10.5369 + 3549 =
11. 11.7035 − 3321 =
12. 12.4431 + 1128 =
13. 13.6527 − 5274 =
14. 14.3728 − 1625 =
15. 15.1910 + 1397 =
16. 16.3598 − 3144 =
17. 17.2179 − 1829 =
18. 18.6128 + 8746 =
19. 19.7879 − 3063 =
20. 20.2627 + 6785 =
21. 21.2860 + 2731 =
22. 22.5620 − 1142 =
23. 23.8757 − 2397 =
24. 24.5305 − 5076 =
25. 25.8880 − 7842 =
26. 26.6421 − 5117 =
27. 27.7859 − 1787 =
28. 28.6097 − 1927 =
29. 29.5976 + 1102 =
30. 30.5219 − 2393 =
31. 31.6220 − 3650 =
32. 32.6083 + 5184 =
33. 33.8580 − 3868 =
34. 34.3954 + 3078 =
35. 35.2296 + 1910 =
36. 36.7889 − 4402 =
37. 37.1358 + 1348 =
38. 38.5244 + 7585 =
39. 39.2017 + 7360 =
40. 40.3088 + 2686 =

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