Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 326 · 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: 68 × 94 = 6392. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 62 × 42 = 2604. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 61 = 5185. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 894 + 916 = 1813. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 581 + 238 = 819. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 16 × 81 = 1296. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 91 × 46 = 4186. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 45 × 23 = 1040. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 22 × 91 = 2002. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 93 = 5117. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 33 × 13 = 428. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 75 × 12 = 905. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 76 × 78 = 5928. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 76 × 17 = 1292. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 18 × 65 = 1170. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 79 = 1264. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 50 = 3700. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 37 × 52 = 1925. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 622 + 130 = 752. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 69 × 49 = 3381. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 92 = 3588. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 60 × 19 = 1140. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 77 × 26 = 1999. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 92 × 31 = 2852. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 42 × 98 = 4118. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 45 × 27 = 1217. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 94 × 60 = 5640. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 89 × 18 = 1602. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 324 + 886 = 1209. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 36 × 32 = 1146. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 949 + 855 = 1804. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 49 × 55 = 2694. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 500 + 771 = 1276. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 283 + 762 = 1045. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 65 × 14 = 910. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 56 = 3412. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 615 + 252 = 867. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 99 × 43 = 4251. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 19 × 97 = 1843. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 240 + 969 = 1213. Correct or wrong? (a) correct (b) wrong

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