4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 61 · 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. 1.2324 + 2333 =
2. 2.1508 + 4217 =
3. 3.1128 + 7454 =
4. 4.5088 − 3167 =
5. 5.6881 + 1346 =
6. 6.1732 − 1597 =
7. 7.3694 + 2543 =
8. 8.7915 + 3177 =
9. 9.5373 − 3611 =
10. 10.4823 + 2959 =
11. 11.8426 − 3633 =
12. 12.7822 + 4920 =
13. 13.5319 + 1189 =
14. 14.7891 − 4953 =
15. 15.1337 + 6783 =
16. 16.7414 − 1101 =
17. 17.1452 + 3402 =
18. 18.6784 + 2225 =
19. 19.8871 − 1709 =
20. 20.7554 + 2572 =
21. 21.8786 + 3654 =
22. 22.3180 + 7226 =
23. 23.2600 + 2580 =
24. 24.8423 + 1316 =
25. 25.7049 − 6238 =
26. 26.3506 + 5127 =
27. 27.3176 + 7386 =
28. 28.7731 − 5064 =
29. 29.2908 + 1558 =
30. 30.7064 + 3067 =
31. 31.5162 + 6286 =
32. 32.4030 + 2357 =
33. 33.6323 − 4863 =
34. 34.7202 + 3121 =
35. 35.8602 − 5456 =
36. 36.7424 + 1519 =
37. 37.8167 − 3253 =
38. 38.3482 + 5741 =
39. 39.5813 + 7765 =
40. 40.8899 − 8703 =

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