Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 230 · 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: 59 × 15 = 879. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 733 + 268 = 999. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 745 + 140 = 885. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 923 + 956 = 1879. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 61 × 50 = 3048. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 893 + 290 = 1177. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 90 × 21 = 1889. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 174 + 350 = 524. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 690 + 679 = 1363. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 876 + 298 = 1174. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 968 + 140 = 1108. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 43 × 21 = 910. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 255 + 932 = 1187. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 96 × 73 = 7008. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 60 × 62 = 3720. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 30 × 13 = 390. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 77 × 39 = 3003. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 91 × 91 = 8281. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 321 + 360 = 686. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 293 + 699 = 986. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 287 + 325 = 612. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 31 × 53 = 1643. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 25 × 55 = 1375. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 947 + 564 = 1505. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 344 + 527 = 871. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 469 + 761 = 1230. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 293 + 149 = 447. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 956 + 933 = 1892. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 424 + 142 = 566. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 51 × 79 = 4021. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 581 + 490 = 1070. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 98 × 45 = 4410. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 91 × 84 = 7644. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 60 × 83 = 4981. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 66 × 32 = 2112. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 45 × 40 = 1801. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 74 = 1332. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 258 + 819 = 1077. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 49 × 25 = 1225. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 44 × 24 = 1056. Correct or wrong? (a) wrong (b) correct

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