4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 13 · 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. 1.8459 − 6806 =
2. 2.6250 + 4092 =
3. 3.7615 + 6603 =
4. 4.7094 + 1986 =
5. 5.5782 + 7285 =
6. 6.7387 + 3451 =
7. 7.4710 − 3883 =
8. 8.8163 − 7398 =
9. 9.6120 − 2366 =
10. 10.7979 − 1934 =
11. 11.1153 + 7759 =
12. 12.2622 + 2223 =
13. 13.4493 + 6010 =
14. 14.8335 − 7930 =
15. 15.5177 − 2029 =
16. 16.5051 − 4624 =
17. 17.8241 − 4310 =
18. 18.5024 + 7938 =
19. 19.1352 − 1166 =
20. 20.7694 − 5404 =
21. 21.5366 − 1519 =
22. 22.8874 − 1612 =
23. 23.4546 + 2488 =
24. 24.4175 + 2539 =
25. 25.3641 + 8136 =
26. 26.5553 − 5515 =
27. 27.5940 − 4298 =
28. 28.3068 − 2097 =
29. 29.1811 + 2893 =
30. 30.6092 − 2360 =
31. 31.4660 + 4930 =
32. 32.5454 + 6332 =
33. 33.1917 + 6621 =
34. 34.6713 + 6473 =
35. 35.7824 − 5720 =
36. 36.1783 + 5139 =
37. 37.2479 + 5083 =
38. 38.3433 − 2197 =
39. 39.5716 − 2517 =
40. 40.2687 + 7926 =

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