Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 794 · 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: 907 + 309 = 1216. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 721 + 738 = 1457. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 78 × 44 = 3428. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 907 + 858 = 1765. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 205 + 592 = 797. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 466 + 311 = 777. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 82 × 70 = 5747. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 29 × 36 = 1044. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 43 × 96 = 4132. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 76 = 4104. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 15 × 79 = 1185. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 219 + 714 = 933. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 68 × 24 = 1628. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 56 × 42 = 2350. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 12 × 67 = 805. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 62 × 55 = 3417. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 363 + 139 = 502. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 75 × 67 = 5025. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 33 × 98 = 3234. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 166 + 520 = 686. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 295 + 494 = 789. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 793 + 898 = 1690. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 88 × 25 = 2196. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 327 + 898 = 1225. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 189 + 275 = 469. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 70 × 81 = 5670. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 14 × 47 = 658. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 662 + 395 = 1057. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 46 = 4508. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 932 + 430 = 1360. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 274 + 589 = 863. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 764 + 699 = 1466. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 80 × 92 = 7360. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 81 × 95 = 7695. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 56 × 52 = 2913. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 54 × 54 = 2908. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 87 × 84 = 7308. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 90 × 45 = 4050. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 934 + 522 = 1462. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 44 × 68 = 2992. Correct or wrong? (a) wrong (b) correct

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