Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 504 · 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: 170 + 534 = 704. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 443 + 410 = 853. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 56 × 16 = 896. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 460 + 511 = 971. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 37 × 59 = 2183. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 52 × 16 = 830. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 75 × 78 = 5850. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 877 + 282 = 1159. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 69 × 49 = 3382. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 83 × 29 = 2400. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 305 + 474 = 782. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 689 + 196 = 885. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 16 × 48 = 768. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 96 × 15 = 1440. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 80 × 89 = 7120. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 95 × 79 = 7507. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 92 = 1196. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 55 × 15 = 825. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 826 + 497 = 1323. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 49 × 76 = 3722. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 172 + 784 = 956. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 455 + 904 = 1357. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 787 + 959 = 1748. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 704 + 791 = 1495. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 24 = 480. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 95 × 27 = 2568. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 44 × 93 = 4092. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 85 × 32 = 2726. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 96 × 84 = 8064. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 68 × 57 = 3876. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 68 × 92 = 6248. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 567 + 143 = 710. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 28 × 25 = 700. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 35 × 72 = 2520. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 960 + 929 = 1889. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 59 × 22 = 1298. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 406 + 768 = 1174. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 93 = 2418. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 913 + 873 = 1789. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 268 + 425 = 690. Correct or wrong? (a) correct (b) wrong

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