4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 37 · 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. 1.4453 + 4502 =
2. 2.5334 + 2465 =
3. 3.5188 − 2559 =
4. 4.8442 − 5684 =
5. 5.8206 − 5461 =
6. 6.7998 − 6672 =
7. 7.4892 − 4027 =
8. 8.3190 − 1865 =
9. 9.4895 + 1963 =
10. 10.4124 − 1447 =
11. 11.6258 + 1529 =
12. 12.6403 − 2286 =
13. 13.3910 − 1363 =
14. 14.7512 − 6232 =
15. 15.5902 + 5069 =
16. 16.7472 + 5082 =
17. 17.2520 − 1212 =
18. 18.7212 − 1634 =
19. 19.3816 − 2753 =
20. 20.7241 + 6348 =
21. 21.3365 − 3146 =
22. 22.3941 + 2495 =
23. 23.7403 − 6189 =
24. 24.8609 − 4010 =
25. 25.5664 − 5130 =
26. 26.8170 + 3217 =
27. 27.3748 − 1776 =
28. 28.7520 − 1909 =
29. 29.6132 + 8957 =
30. 30.8053 − 5211 =
31. 31.2659 − 2092 =
32. 32.1560 + 8099 =
33. 33.7004 + 6737 =
34. 34.4835 − 4165 =
35. 35.6502 − 2415 =
36. 36.4080 − 3335 =
37. 37.4606 − 2456 =
38. 38.4402 − 2135 =
39. 39.7267 − 1179 =
40. 40.3104 + 3758 =

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