Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 590 · 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: 147 + 642 = 792. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 33 × 84 = 2772. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 39 = 3432. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 348 + 986 = 1334. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 146 + 442 = 588. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 541 + 606 = 1150. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 96 × 82 = 7874. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 46 × 23 = 1058. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 35 × 84 = 2935. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 87 × 33 = 2871. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 199 + 508 = 707. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 842 + 889 = 1731. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 575 + 267 = 842. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 32 × 43 = 1376. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 499 + 196 = 695. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 752 + 293 = 1045. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 18 × 46 = 824. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 32 × 28 = 889. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 72 × 42 = 3030. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 50 × 28 = 1400. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 47 × 51 = 2397. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 38 × 33 = 1254. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 548 + 437 = 989. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 527 + 497 = 1024. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 967 + 252 = 1221. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 46 × 35 = 1610. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 949 + 164 = 1112. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 810 + 230 = 1034. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 47 = 893. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 121 + 158 = 284. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 45 × 31 = 1396. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 94 × 63 = 5920. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 17 × 95 = 1615. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 227 + 355 = 585. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 71 × 32 = 2272. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 22 × 91 = 1998. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 84 × 33 = 2772. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 70 × 88 = 6166. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 94 × 23 = 2161. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 52 × 64 = 3328. Correct or wrong? (a) wrong (b) correct

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