Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 214 · 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: 58 × 66 = 3827. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 54 × 79 = 4258. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 18 × 19 = 349. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 54 × 40 = 2164. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 158 + 981 = 1138. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 71 × 65 = 4615. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 511 + 151 = 662. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 54 × 87 = 4698. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 55 × 57 = 3135. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 46 × 19 = 874. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 144 + 120 = 266. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 89 × 92 = 8188. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 406 + 806 = 1209. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 47 × 58 = 2726. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 12 × 91 = 1092. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 845 + 144 = 989. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 184 + 895 = 1079. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 914 + 156 = 1070. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 201 + 751 = 945. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 44 × 33 = 1452. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 419 + 837 = 1256. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 33 = 429. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 391 + 775 = 1162. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 75 × 57 = 4275. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 33 × 51 = 1683. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 183 + 249 = 432. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 32 = 992. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 82 × 78 = 6396. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 27 × 18 = 488. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 852 + 302 = 1159. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 38 × 59 = 2242. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 247 + 849 = 1096. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 854 + 184 = 1038. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 514 + 740 = 1249. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 203 + 683 = 886. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 34 = 2080. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 60 = 3180. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 37 × 22 = 814. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 518 + 216 = 734. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 389 + 173 = 562. Correct or wrong? (a) correct (b) wrong

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