Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 17 · 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: 568 + 731 = 1299. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 73 × 66 = 4818. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 78 × 63 = 4914. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 664 + 314 = 980. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 331 + 164 = 491. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 12 × 18 = 216. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 34 × 33 = 1122. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 718 + 741 = 1456. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 77 = 1534. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 594 + 293 = 887. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 86 × 61 = 5246. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 712 + 790 = 1502. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 27 × 31 = 837. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 22 × 89 = 1959. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 889 + 759 = 1656. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 55 × 74 = 4070. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 998 + 612 = 1611. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 33 × 19 = 627. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 22 × 53 = 1168. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 80 = 1440. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 393 + 246 = 639. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 37 = 858. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 26 × 56 = 1461. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 299 + 299 = 598. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 735 + 233 = 963. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 213 + 348 = 561. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 673 + 842 = 1507. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 36 × 55 = 1973. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 90 × 74 = 6660. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 91 × 41 = 3731. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 245 + 262 = 507. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 72 × 30 = 2160. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 63 × 31 = 1961. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 57 × 38 = 2166. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 53 × 20 = 1059. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 43 = 3998. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 65 × 54 = 3510. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 266 + 949 = 1218. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 64 × 56 = 3584. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 39 × 82 = 3198. Correct or wrong? (a) correct (b) wrong

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