4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 213 · 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. 1.6461 + 4093 =
2. 2.5220 − 2426 =
3. 3.6998 − 2201 =
4. 4.4209 − 1204 =
5. 5.3111 + 1544 =
6. 6.1508 + 7992 =
7. 7.8545 + 3958 =
8. 8.8859 + 4639 =
9. 9.4845 + 8779 =
10. 10.3112 − 1583 =
11. 11.8094 − 1145 =
12. 12.7560 + 2678 =
13. 13.8208 − 4092 =
14. 14.8384 − 4262 =
15. 15.4562 − 4487 =
16. 16.2126 + 2837 =
17. 17.1771 + 2819 =
18. 18.8759 + 6641 =
19. 19.1865 + 1710 =
20. 20.7108 + 4737 =
21. 21.7188 + 7607 =
22. 22.6370 − 2120 =
23. 23.8716 + 4428 =
24. 24.4481 + 2766 =
25. 25.4849 − 3444 =
26. 26.4515 + 5487 =
27. 27.6580 + 1400 =
28. 28.5306 − 2424 =
29. 29.6963 − 1346 =
30. 30.1176 + 2733 =
31. 31.3003 + 4191 =
32. 32.4778 − 1912 =
33. 33.6041 + 8881 =
34. 34.3147 + 2476 =
35. 35.5297 − 4464 =
36. 36.8394 − 6742 =
37. 37.5668 − 5502 =
38. 38.8608 + 8536 =
39. 39.2745 + 1511 =
40. 40.8281 + 8834 =

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