Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 338 · 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: 129 + 723 = 854. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 25 = 2225. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 28 = 692. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 12 = 663. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 805 + 502 = 1307. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 908 + 580 = 1488. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 150 + 206 = 356. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 451 + 366 = 817. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 26 × 85 = 2210. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 34 × 40 = 1355. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 170 + 990 = 1160. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 56 × 53 = 2966. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 47 × 16 = 752. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 87 × 24 = 2088. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 15 × 25 = 375. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 17 × 23 = 391. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 34 × 21 = 709. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 819 + 356 = 1172. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 35 × 68 = 2380. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 754 + 280 = 1034. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 82 × 55 = 4510. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 834 + 144 = 978. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 19 × 64 = 1218. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 969 + 322 = 1291. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 51 × 74 = 3774. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 84 × 74 = 6216. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 99 × 45 = 4455. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 304 + 743 = 1047. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 15 × 71 = 1057. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 98 × 53 = 5195. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 32 × 92 = 2944. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 403 + 590 = 993. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 47 × 87 = 4089. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 57 × 87 = 4952. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 39 × 67 = 2616. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 558 + 825 = 1380. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 56 × 23 = 1288. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 158 + 713 = 871. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 41 × 15 = 615. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 21 = 1519. Correct or wrong? (a) wrong (b) correct

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