Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 12 · 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: 29 × 89 = 2577. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 668 + 522 = 1190. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 642 + 127 = 769. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 15 = 831. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 66 × 21 = 1389. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 682 + 136 = 823. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 554 + 800 = 1352. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 824 + 128 = 952. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 68 × 69 = 4689. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 339 + 701 = 1040. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 53 × 98 = 5194. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 235 + 242 = 477. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 36 × 62 = 2232. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 278 + 989 = 1267. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 51 × 42 = 2140. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 20 × 24 = 480. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 656 + 889 = 1545. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 69 × 83 = 5727. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 43 × 81 = 3483. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 79 × 24 = 1900. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 514 + 230 = 744. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 91 × 27 = 2456. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 66 = 922. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 94 × 31 = 2914. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 16 × 13 = 208. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 75 × 93 = 6980. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 303 + 475 = 771. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 81 × 76 = 6149. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 565 + 582 = 1147. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 172 + 299 = 471. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 59 × 33 = 1947. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 49 = 593. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 683 + 406 = 1089. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 95 × 25 = 2375. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 82 × 66 = 5404. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 98 × 34 = 3325. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 789 + 566 = 1348. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 279 + 308 = 587. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 916 + 565 = 1478. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 31 × 12 = 372. Correct or wrong? (a) wrong (b) correct

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