4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 19 · 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. 1.1164 + 4510 =
2. 2.8475 − 3839 =
3. 3.4206 + 4811 =
4. 4.4601 − 1935 =
5. 5.1472 + 1337 =
6. 6.8705 − 8372 =
7. 7.7871 − 5410 =
8. 8.4433 − 2833 =
9. 9.2333 − 1417 =
10. 10.3422 − 2931 =
11. 11.2468 − 2424 =
12. 12.8189 − 3037 =
13. 13.6681 + 8682 =
14. 14.7196 − 5952 =
15. 15.3798 + 6614 =
16. 16.2235 + 2044 =
17. 17.5344 − 3725 =
18. 18.7684 − 3764 =
19. 19.6967 + 6649 =
20. 20.5488 − 4784 =
21. 21.5106 − 2655 =
22. 22.5182 + 1823 =
23. 23.6853 − 2525 =
24. 24.4098 + 5618 =
25. 25.7664 + 2236 =
26. 26.6432 + 4575 =
27. 27.4465 + 3634 =
28. 28.5522 + 2491 =
29. 29.2962 + 2320 =
30. 30.6408 + 3495 =
31. 31.6239 + 6695 =
32. 32.5820 + 3364 =
33. 33.5450 − 1153 =
34. 34.2442 − 2115 =
35. 35.5335 + 3560 =
36. 36.7347 + 4184 =
37. 37.5751 − 4288 =
38. 38.1793 + 4851 =
39. 39.5821 − 1135 =
40. 40.1673 + 8752 =

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