Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 300 · 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: 824 + 983 = 1807. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 33 × 48 = 1587. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 343 + 225 = 568. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 54 × 80 = 4325. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 74 × 97 = 7178. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 48 × 33 = 1584. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 17 × 90 = 1530. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 278 + 291 = 564. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 55 × 50 = 2754. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 23 × 75 = 1725. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 89 × 99 = 8811. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 46 × 50 = 2300. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 933 + 292 = 1220. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 75 × 20 = 1495. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 409 + 619 = 1028. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 82 × 44 = 3616. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 66 × 85 = 5610. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 53 × 79 = 4187. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 83 × 88 = 7312. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 58 × 41 = 2377. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 79 × 98 = 7736. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 857 + 963 = 1823. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 856 + 331 = 1187. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 460 + 737 = 1197. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 42 × 31 = 1305. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 500 + 254 = 757. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 994 + 423 = 1417. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 98 × 19 = 1865. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 23 × 91 = 2089. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 87 × 75 = 6525. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 123 + 523 = 646. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 49 × 31 = 1516. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 918 + 741 = 1665. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 325 + 697 = 1022. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 213 + 774 = 995. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 372 + 153 = 524. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 319 + 742 = 1061. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 69 × 71 = 4894. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 15 × 26 = 392. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 99 × 94 = 9306. Correct or wrong? (a) correct (b) wrong

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