4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 111 · 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. 1.7896 + 4435 =
2. 2.2632 − 1420 =
3. 3.5095 + 3701 =
4. 4.6744 − 3781 =
5. 5.5939 + 2278 =
6. 6.7565 − 5042 =
7. 7.1808 + 6320 =
8. 8.7094 − 4365 =
9. 9.7636 + 1542 =
10. 10.2564 + 5263 =
11. 11.1142 + 8105 =
12. 12.8388 − 7454 =
13. 13.6160 − 2086 =
14. 14.5273 + 5847 =
15. 15.7902 − 7777 =
16. 16.8372 + 5629 =
17. 17.7323 + 8178 =
18. 18.1720 + 7571 =
19. 19.5999 + 3686 =
20. 20.6791 + 1337 =
21. 21.7658 + 1568 =
22. 22.2083 + 2393 =
23. 23.7201 − 2942 =
24. 24.8559 + 2773 =
25. 25.7984 − 7830 =
26. 26.7627 + 4017 =
27. 27.8467 − 2966 =
28. 28.7624 + 5787 =
29. 29.8429 − 5119 =
30. 30.8350 + 7791 =
31. 31.5296 − 4959 =
32. 32.7477 − 2273 =
33. 33.2195 + 2607 =
34. 34.3512 + 2403 =
35. 35.2927 + 1157 =
36. 36.2757 + 5805 =
37. 37.5386 + 2583 =
38. 38.1204 + 3204 =
39. 39.6277 − 1325 =
40. 40.7485 + 6675 =

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