4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 44 · 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. 1.7213 + 3716 =
2. 2.4203 + 6449 =
3. 3.3045 + 3715 =
4. 4.3527 − 1214 =
5. 5.5403 − 2606 =
6. 6.6614 + 4286 =
7. 7.7659 − 5536 =
8. 8.3024 + 1114 =
9. 9.8306 − 1830 =
10. 10.4082 + 6980 =
11. 11.7324 − 6158 =
12. 12.4957 + 8146 =
13. 13.8410 + 7049 =
14. 14.5364 + 2918 =
15. 15.5576 + 8939 =
16. 16.2130 − 1556 =
17. 17.4931 + 2657 =
18. 18.6065 − 3334 =
19. 19.1686 + 6121 =
20. 20.1187 + 6530 =
21. 21.4670 − 3096 =
22. 22.5187 + 1293 =
23. 23.5098 + 6287 =
24. 24.6070 + 3208 =
25. 25.8016 − 5201 =
26. 26.6231 + 1135 =
27. 27.3336 + 7756 =
28. 28.7643 + 2053 =
29. 29.2740 − 2410 =
30. 30.8822 + 2230 =
31. 31.7443 + 5439 =
32. 32.3827 + 1338 =
33. 33.7906 − 4421 =
34. 34.7576 − 3200 =
35. 35.8166 + 4605 =
36. 36.2429 + 2771 =
37. 37.6414 + 2983 =
38. 38.2880 + 5926 =
39. 39.8757 + 1595 =
40. 40.2714 + 6535 =

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