Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 593 · 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: 923 + 164 = 1087. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 553 + 472 = 1031. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 22 × 73 = 1606. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 253 + 709 = 962. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 53 × 68 = 3599. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 62 × 68 = 4211. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 461 + 986 = 1441. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 94 × 37 = 3478. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 89 × 25 = 2225. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 704 + 504 = 1208. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 26 × 43 = 1118. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 16 × 79 = 1264. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 124 + 475 = 599. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 35 × 17 = 602. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 68 × 84 = 5711. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 502 + 180 = 679. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 56 × 17 = 945. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 51 × 28 = 1428. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 84 × 51 = 4284. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 26 × 33 = 857. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 29 × 63 = 1834. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 62 × 24 = 1488. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 94 × 91 = 8554. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 95 × 20 = 1897. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 210 + 263 = 473. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 91 × 47 = 4277. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 242 + 882 = 1131. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 22 × 59 = 1298. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 572 + 903 = 1477. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 42 = 2524. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 44 × 77 = 3381. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 76 × 66 = 5023. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 715 + 547 = 1262. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 730 + 815 = 1547. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 90 × 28 = 2520. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 22 = 1667. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 50 = 1300. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 70 × 99 = 6930. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 206 + 126 = 332. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 86 × 43 = 3698. Correct or wrong? (a) wrong (b) correct

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