Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 480 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 794 + 848 = 1642. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 24 × 99 = 2376. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 556 + 783 = 1339. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 89 × 20 = 1780. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 98 × 13 = 1274. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 446 + 253 = 699. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 969 + 618 = 1582. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 364 + 557 = 921. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 13 × 48 = 624. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 71 × 36 = 2558. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 16 = 528. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 39 × 21 = 819. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 90 × 98 = 8820. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 32 × 73 = 2333. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 520 + 508 = 1028. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 88 × 50 = 4396. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 79 × 58 = 4582. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 663 + 723 = 1391. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 28 × 78 = 2187. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 13 × 55 = 720. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 740 + 456 = 1196. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 79 × 83 = 6562. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 34 × 46 = 1564. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 707 + 732 = 1443. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 40 × 13 = 520. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 71 × 82 = 5830. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 801 + 165 = 966. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 44 × 26 = 1144. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 30 × 97 = 2908. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 12 × 98 = 1176. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 794 + 133 = 933. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 571 + 810 = 1381. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 47 × 25 = 1173. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 73 × 26 = 1900. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 182 + 795 = 982. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 215 + 169 = 384. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 86 × 29 = 2496. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 43 = 2322. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 909 + 407 = 1324. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 393 + 288 = 681. Correct or wrong? (a) wrong (b) correct

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