4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 126 · 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. 1.4599 − 2339 =
2. 2.5098 + 8241 =
3. 3.6511 + 8723 =
4. 4.7932 + 8862 =
5. 5.8767 − 3180 =
6. 6.7499 + 8490 =
7. 7.6657 + 1806 =
8. 8.8029 − 3239 =
9. 9.1714 − 1466 =
10. 10.6795 − 6197 =
11. 11.7073 − 2202 =
12. 12.8509 + 4046 =
13. 13.8438 − 6834 =
14. 14.8020 − 3169 =
15. 15.8105 − 5229 =
16. 16.8399 + 3680 =
17. 17.8182 − 3611 =
18. 18.2217 + 6607 =
19. 19.7172 − 1516 =
20. 20.3248 + 5600 =
21. 21.7874 − 5818 =
22. 22.7620 + 7496 =
23. 23.4835 − 4145 =
24. 24.5037 + 7373 =
25. 25.8675 − 7401 =
26. 26.6738 − 2198 =
27. 27.8450 + 4740 =
28. 28.1438 + 2760 =
29. 29.6854 − 5969 =
30. 30.8581 + 1929 =
31. 31.5920 − 4993 =
32. 32.1886 + 8280 =
33. 33.6143 − 5004 =
34. 34.4648 − 1108 =
35. 35.2082 + 6978 =
36. 36.3362 + 1822 =
37. 37.4750 − 3178 =
38. 38.8047 − 1400 =
39. 39.6617 − 5851 =
40. 40.4171 − 1337 =

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