4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 168 · 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. 1.3485 + 4385 =
2. 2.2546 − 2118 =
3. 3.1300 + 3110 =
4. 4.7685 + 7251 =
5. 5.8760 − 7221 =
6. 6.7880 + 4393 =
7. 7.5863 + 3479 =
8. 8.8953 + 8593 =
9. 9.7332 − 6418 =
10. 10.3685 + 5621 =
11. 11.6783 + 3521 =
12. 12.8628 − 3633 =
13. 13.7420 − 4322 =
14. 14.1476 − 1126 =
15. 15.6088 + 2600 =
16. 16.6550 − 1719 =
17. 17.2178 + 6730 =
18. 18.4068 − 3596 =
19. 19.5264 + 3290 =
20. 20.7236 − 6302 =
21. 21.4745 − 1343 =
22. 22.6193 + 6270 =
23. 23.7394 − 6278 =
24. 24.6187 − 4917 =
25. 25.7070 − 2670 =
26. 26.4763 − 3323 =
27. 27.1748 + 1755 =
28. 28.7967 − 5720 =
29. 29.4138 + 3200 =
30. 30.6473 + 3511 =
31. 31.2388 + 1273 =
32. 32.2974 − 2826 =
33. 33.8229 − 1128 =
34. 34.6907 + 2956 =
35. 35.5449 + 5031 =
36. 36.5289 − 2333 =
37. 37.3205 − 2756 =
38. 38.6754 + 5931 =
39. 39.2260 − 1924 =
40. 40.6274 + 2233 =

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