Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 701 · 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: 49 × 56 = 2744. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 600 + 455 = 1055. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 68 × 84 = 5709. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 505 + 899 = 1404. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 678 + 148 = 819. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 80 × 93 = 7440. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 72 = 4968. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 43 × 83 = 3573. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 93 × 71 = 6603. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 786 + 560 = 1346. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 270 + 208 = 472. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 27 × 49 = 1326. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 194 + 649 = 848. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 46 × 22 = 1019. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 740 + 769 = 1509. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 66 × 44 = 2904. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 26 × 30 = 780. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 28 = 672. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 500 + 209 = 717. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 92 × 55 = 5062. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 230 + 588 = 812. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 162 + 544 = 706. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 486 + 499 = 985. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 618 + 821 = 1432. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 48 × 69 = 3309. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 543 + 330 = 870. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 45 × 31 = 1387. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 82 × 89 = 7306. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 812 + 725 = 1543. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 344 + 486 = 830. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 87 × 83 = 7223. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 236 + 565 = 803. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 44 × 64 = 2810. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 240 + 418 = 658. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 97 × 12 = 1164. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 395 + 593 = 995. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 428 + 611 = 1039. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 63 × 38 = 2392. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 24 × 31 = 744. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 96 × 81 = 7776. Correct or wrong? (a) correct (b) wrong

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