Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 251 · 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: 137 + 965 = 1102. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 42 × 31 = 1298. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 65 × 34 = 2210. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 86 = 2580. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 55 × 49 = 2690. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 47 = 4230. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 636 + 425 = 1061. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 24 × 71 = 1704. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 17 × 40 = 685. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 868 + 276 = 1144. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 949 + 449 = 1398. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 69 × 32 = 2208. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 644 + 183 = 823. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 53 × 57 = 3019. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 449 + 525 = 967. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 14 × 49 = 686. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 594 + 659 = 1253. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 554 + 480 = 1039. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 789 + 789 = 1578. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 69 × 62 = 4278. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 40 = 2758. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 27 × 73 = 1971. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 86 × 28 = 2401. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 439 + 252 = 691. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 516 + 791 = 1314. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 55 × 85 = 4676. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 553 + 156 = 710. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 904 + 395 = 1306. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 54 × 44 = 2376. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 84 × 33 = 2778. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 618 + 407 = 1020. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 531 + 670 = 1201. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 843 + 707 = 1547. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 539 + 938 = 1472. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 150 + 995 = 1145. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 68 × 14 = 949. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 952 + 730 = 1679. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 67 = 3082. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 31 × 57 = 1769. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 30 × 97 = 2910. Correct or wrong? (a) wrong (b) correct

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