Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 754 · 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: 755 + 474 = 1229. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 935 + 405 = 1334. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 264 + 866 = 1130. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 50 × 98 = 4900. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 57 × 71 = 4047. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 562 + 498 = 1060. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 13 = 494. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 44 × 50 = 2200. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 18 = 218. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 705 + 357 = 1062. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 125 + 354 = 475. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 811 + 881 = 1687. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 27 × 84 = 2263. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 332 + 248 = 580. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 27 × 26 = 702. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 79 × 13 = 1027. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 216 + 290 = 513. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 17 × 52 = 884. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 204 + 792 = 996. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 539 + 130 = 669. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 96 × 92 = 8837. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 881 + 126 = 1014. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 12 × 25 = 300. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 905 + 682 = 1586. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 51 × 20 = 1020. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 36 × 52 = 1872. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 18 × 67 = 1206. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 381 + 215 = 597. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 41 = 3526. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 25 × 82 = 2051. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 69 = 2823. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 680 + 401 = 1082. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 855 + 147 = 1005. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 60 × 79 = 4740. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 508 + 550 = 1058. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 40 = 1555. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 353 + 997 = 1350. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 89 × 74 = 6586. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 40 = 515. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 26 × 93 = 2416. Correct or wrong? (a) wrong (b) correct

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