4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 136 · 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. 1.7999 − 1811 =
2. 2.8087 − 6026 =
3. 3.1745 + 1574 =
4. 4.8130 − 5794 =
5. 5.3726 − 1378 =
6. 6.5855 − 5046 =
7. 7.6171 − 5664 =
8. 8.5958 + 2096 =
9. 9.6326 − 2055 =
10. 10.3380 + 4670 =
11. 11.8960 − 5209 =
12. 12.2509 − 2481 =
13. 13.5147 − 1123 =
14. 14.6464 − 5424 =
15. 15.3408 + 6137 =
16. 16.6795 − 3520 =
17. 17.3407 − 2347 =
18. 18.5512 + 6527 =
19. 19.2054 + 3519 =
20. 20.6947 + 8774 =
21. 21.7249 − 4734 =
22. 22.8680 − 2272 =
23. 23.7332 − 4850 =
24. 24.8782 − 6860 =
25. 25.6665 − 5300 =
26. 26.8080 + 6401 =
27. 27.8389 − 4532 =
28. 28.7559 − 4213 =
29. 29.6170 + 1385 =
30. 30.5842 + 8455 =
31. 31.6862 − 4158 =
32. 32.4510 − 2130 =
33. 33.8970 − 8638 =
34. 34.4172 − 2125 =
35. 35.1582 + 3377 =
36. 36.2674 − 1680 =
37. 37.1111 + 5898 =
38. 38.8942 − 5959 =
39. 39.2612 + 1630 =
40. 40.5071 + 5421 =

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