4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 161 · 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. 1.5959 + 8090 =
2. 2.6720 − 5864 =
3. 3.4598 + 7711 =
4. 4.6708 + 3802 =
5. 5.5012 + 6277 =
6. 6.4894 − 2667 =
7. 7.3373 + 2367 =
8. 8.2231 + 7527 =
9. 9.8875 − 4826 =
10. 10.3887 + 4317 =
11. 11.6996 + 2303 =
12. 12.5308 − 3961 =
13. 13.7018 − 2797 =
14. 14.5171 + 1782 =
15. 15.5940 + 5103 =
16. 16.1315 + 5091 =
17. 17.2240 + 1617 =
18. 18.8723 + 6575 =
19. 19.6736 − 3242 =
20. 20.4908 − 3615 =
21. 21.8990 − 4430 =
22. 22.8967 − 8794 =
23. 23.5020 − 4295 =
24. 24.5027 + 6305 =
25. 25.7282 + 5418 =
26. 26.7273 + 3631 =
27. 27.8132 − 6939 =
28. 28.3456 + 7774 =
29. 29.5113 − 3814 =
30. 30.4826 − 4271 =
31. 31.2863 + 2547 =
32. 32.1543 + 2756 =
33. 33.8978 − 5247 =
34. 34.2455 − 2429 =
35. 35.7960 − 2069 =
36. 36.6984 − 6572 =
37. 37.7492 − 2608 =
38. 38.4351 − 4187 =
39. 39.4347 + 6157 =
40. 40.6140 + 8135 =

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