Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 189 · 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: 156 + 568 = 720. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 19 × 49 = 931. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 285 + 123 = 410. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 176 + 795 = 971. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 874 + 588 = 1462. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 73 × 33 = 2404. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 25 × 36 = 899. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 14 × 13 = 182. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 56 × 91 = 5096. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 976 + 206 = 1182. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 44 × 63 = 2772. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 44 × 49 = 2161. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 53 × 87 = 4603. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 58 × 57 = 3306. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 57 × 61 = 3477. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 321 + 407 = 728. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 249 + 542 = 786. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 54 × 33 = 1788. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 45 × 92 = 4140. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 86 × 42 = 3612. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 766 + 299 = 1058. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 69 × 16 = 1104. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 80 × 96 = 7680. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 54 × 28 = 1514. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 353 + 379 = 733. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 20 × 53 = 1062. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 793 + 285 = 1078. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 460 + 375 = 837. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 12 × 20 = 235. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 52 × 33 = 1716. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 64 × 85 = 5440. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 566 + 883 = 1457. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 464 + 289 = 753. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 20 × 80 = 1600. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 235 + 557 = 792. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 930 + 696 = 1626. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 565 + 299 = 864. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 697 + 220 = 918. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 47 × 25 = 1180. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 627 + 149 = 773. Correct or wrong? (a) correct (b) wrong

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