4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 55 · 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. 1.4764 + 2554 =
2. 2.2620 − 1884 =
3. 3.3007 − 1313 =
4. 4.8373 + 5687 =
5. 5.1603 + 5933 =
6. 6.5005 − 3315 =
7. 7.8875 + 1572 =
8. 8.6036 + 8436 =
9. 9.7876 + 5071 =
10. 10.5943 + 4737 =
11. 11.8808 − 1398 =
12. 12.6307 − 3491 =
13. 13.7007 − 3006 =
14. 14.1953 + 3350 =
15. 15.1759 + 3205 =
16. 16.2311 − 2164 =
17. 17.6650 + 4671 =
18. 18.6162 − 5133 =
19. 19.1261 + 2725 =
20. 20.4597 − 3919 =
21. 21.4617 − 3319 =
22. 22.3518 − 2616 =
23. 23.7693 + 7756 =
24. 24.5020 − 3127 =
25. 25.6230 − 2287 =
26. 26.3699 − 3478 =
27. 27.7014 + 8479 =
28. 28.5727 + 4508 =
29. 29.5682 + 5873 =
30. 30.4759 − 1879 =
31. 31.7139 + 7641 =
32. 32.4868 − 2118 =
33. 33.7544 − 1310 =
34. 34.6465 − 4849 =
35. 35.5116 − 2811 =
36. 36.2846 + 1857 =
37. 37.5947 − 4496 =
38. 38.7311 − 6922 =
39. 39.3942 + 2153 =
40. 40.4572 + 7271 =

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