Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 863 · 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: 17 × 54 = 918. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 589 + 918 = 1509. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 40 = 3840. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 94 × 64 = 6016. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 300 + 514 = 814. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 61 × 20 = 1214. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 418 + 158 = 576. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 596 + 943 = 1539. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 97 × 12 = 1165. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 89 = 5790. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 470 + 420 = 890. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 89 = 1335. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 19 × 89 = 1695. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 463 + 208 = 675. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 36 × 23 = 828. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 224 + 314 = 538. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 88 = 3080. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 135 + 692 = 829. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 71 × 35 = 2479. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 54 × 78 = 4212. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 550 + 524 = 1073. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 300 + 957 = 1261. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 542 + 327 = 865. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 649 + 974 = 1623. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 58 × 20 = 1163. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 549 + 442 = 991. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 655 + 955 = 1610. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 850 + 622 = 1480. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 13 × 25 = 331. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 83 × 64 = 5312. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 661 + 198 = 859. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 285 + 963 = 1248. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 65 = 4558. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 69 × 42 = 2898. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 964 + 369 = 1333. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 13 × 90 = 1170. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 760 + 273 = 1033. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 567 + 467 = 1039. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 283 + 196 = 477. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 19 × 38 = 722. Correct or wrong? (a) correct (b) wrong

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