Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 170 · 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: 27 × 34 = 911. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 909 + 616 = 1525. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 41 × 25 = 1025. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 56 × 49 = 2744. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 85 × 95 = 8077. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 26 × 60 = 1560. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 18 × 79 = 1422. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 41 × 59 = 2419. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 892 + 304 = 1203. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 23 × 94 = 2161. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 72 × 65 = 4681. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 60 × 19 = 1140. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 31 × 47 = 1460. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 206 + 151 = 357. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 222 + 986 = 1208. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 72 × 53 = 3816. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 33 × 42 = 1386. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 651 + 611 = 1262. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 55 × 36 = 1981. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 17 × 88 = 1495. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 367 + 378 = 743. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 724 + 609 = 1336. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 54 × 79 = 4268. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 316 + 630 = 948. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 271 + 927 = 1198. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 15 × 27 = 405. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 747 + 834 = 1576. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 27 × 26 = 702. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 98 × 78 = 7644. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 26 × 37 = 962. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 26 × 23 = 598. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 74 × 82 = 6062. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 73 × 85 = 6205. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 598 + 942 = 1540. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 51 × 98 = 4998. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 52 × 95 = 4940. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 67 × 26 = 1737. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 77 × 88 = 6781. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 88 × 75 = 6603. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 22 × 80 = 1761. Correct or wrong? (a) correct (b) wrong

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