Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 207 · 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: 55 × 73 = 4009. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 209 + 778 = 987. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 68 × 18 = 1231. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 49 × 42 = 2061. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 95 × 91 = 8653. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 53 × 35 = 1855. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 93 × 58 = 5394. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 66 × 60 = 3960. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 39 = 975. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 46 × 52 = 2394. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 92 × 77 = 7084. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 187 + 282 = 475. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 46 × 93 = 4278. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 996 + 495 = 1487. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 87 × 95 = 8273. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 370 + 585 = 955. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 64 = 2184. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 494 + 393 = 887. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 85 × 23 = 1955. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 14 = 251. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 45 × 73 = 3285. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 19 × 91 = 1729. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 80 × 56 = 4485. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 86 × 77 = 6629. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 617 + 204 = 821. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 23 × 73 = 1679. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 23 × 89 = 2047. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 27 × 19 = 513. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 696 + 682 = 1378. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 12 × 39 = 473. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 286 + 445 = 734. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 30 × 97 = 2913. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 63 × 97 = 6105. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 379 + 467 = 852. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 28 × 61 = 1701. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 888 + 826 = 1714. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 91 × 97 = 8827. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 42 × 65 = 2725. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 56 × 64 = 3584. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 81 × 49 = 3976. Correct or wrong? (a) wrong (b) correct

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