4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 124 · 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. 1.7977 + 5319 =
2. 2.7230 + 1994 =
3. 3.6209 − 5977 =
4. 4.8403 − 4883 =
5. 5.4223 − 3561 =
6. 6.2954 + 4413 =
7. 7.1570 − 1306 =
8. 8.5858 + 6599 =
9. 9.7984 − 7547 =
10. 10.6241 + 6143 =
11. 11.7330 + 1367 =
12. 12.2514 + 7971 =
13. 13.4939 − 2607 =
14. 14.5043 − 3393 =
15. 15.8343 − 8062 =
16. 16.4321 − 1823 =
17. 17.7159 − 5602 =
18. 18.1581 + 4266 =
19. 19.6845 + 1599 =
20. 20.4459 + 1628 =
21. 21.6948 − 3322 =
22. 22.4472 − 2069 =
23. 23.4416 − 3468 =
24. 24.7876 − 1707 =
25. 25.8719 + 3400 =
26. 26.2216 + 2366 =
27. 27.3900 + 1770 =
28. 28.1971 + 2397 =
29. 29.6109 − 1957 =
30. 30.1110 + 7111 =
31. 31.4497 − 1573 =
32. 32.4735 + 7028 =
33. 33.8042 + 4140 =
34. 34.5336 − 5033 =
35. 35.5364 + 4584 =
36. 36.7855 − 3022 =
37. 37.5521 − 5462 =
38. 38.4083 − 1833 =
39. 39.8855 + 1556 =
40. 40.6501 + 1600 =

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