4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 132 · 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. 1.7385 − 2511 =
2. 2.2829 + 6398 =
3. 3.8561 − 3845 =
4. 4.4607 + 7131 =
5. 5.2096 + 3959 =
6. 6.4611 − 3046 =
7. 7.7540 − 1938 =
8. 8.4670 − 1902 =
9. 9.6250 + 2799 =
10. 10.6267 + 7942 =
11. 11.2955 + 4186 =
12. 12.7105 + 5861 =
13. 13.4881 + 7095 =
14. 14.3905 − 2616 =
15. 15.7009 − 1216 =
16. 16.2685 + 3239 =
17. 17.3233 + 4754 =
18. 18.7997 + 4885 =
19. 19.3530 − 2704 =
20. 20.7882 − 6792 =
21. 21.4652 − 3040 =
22. 22.2178 + 8180 =
23. 23.5275 + 4232 =
24. 24.8838 + 3047 =
25. 25.4783 − 2205 =
26. 26.2521 + 8614 =
27. 27.1150 + 5214 =
28. 28.5780 − 2118 =
29. 29.7446 − 1724 =
30. 30.5789 − 2412 =
31. 31.4679 − 3741 =
32. 32.3427 + 6435 =
33. 33.2949 + 8720 =
34. 34.5792 − 4742 =
35. 35.7975 − 2780 =
36. 36.7953 − 3971 =
37. 37.2763 − 1295 =
38. 38.5794 − 4258 =
39. 39.7042 + 1853 =
40. 40.7371 − 1991 =

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