Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 888 · 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: 691 + 493 = 1184. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 87 × 46 = 4002. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 437 + 748 = 1180. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 160 + 246 = 406. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 78 × 14 = 1094. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 70 × 17 = 1187. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 17 = 578. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 646 + 235 = 886. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 36 × 88 = 3168. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 33 × 17 = 559. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 88 × 58 = 5104. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 811 + 830 = 1641. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 90 × 64 = 5755. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 482 + 321 = 797. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 29 × 26 = 758. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 756 + 550 = 1306. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 65 × 54 = 3518. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 884 + 906 = 1790. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 34 × 31 = 1054. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 25 × 20 = 501. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 70 × 66 = 4620. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 67 × 74 = 4954. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 51 × 37 = 1887. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 15 × 50 = 750. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 362 + 462 = 824. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 74 × 76 = 5618. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 837 + 137 = 974. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 753 + 550 = 1303. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 623 + 680 = 1296. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 88 × 95 = 8365. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 22 × 32 = 704. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 339 + 455 = 801. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 512 + 756 = 1268. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 906 + 999 = 1905. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 948 + 302 = 1258. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 65 × 12 = 780. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 717 + 736 = 1445. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 82 = 1230. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 486 + 844 = 1330. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 29 × 83 = 2411. Correct or wrong? (a) correct (b) wrong

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