Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 491 · 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: 79 × 19 = 1501. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 20 × 38 = 755. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 47 × 89 = 4178. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 81 = 2430. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 397 + 751 = 1148. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 17 × 73 = 1241. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 97 = 8628. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 66 × 60 = 3952. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 225 + 520 = 745. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 983 + 950 = 1935. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 22 × 86 = 1891. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 90 × 87 = 7833. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 725 + 378 = 1103. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 496 + 210 = 711. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 77 × 65 = 5005. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 33 × 38 = 1254. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 655 + 385 = 1040. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 34 × 26 = 884. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 65 = 1177. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 29 × 38 = 1108. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 171 + 173 = 344. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 152 + 950 = 1102. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 904 + 895 = 1795. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 354 + 346 = 701. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 61 × 93 = 5673. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 601 + 306 = 907. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 346 + 726 = 1066. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 550 + 340 = 898. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 937 + 990 = 1935. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 394 + 383 = 776. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 608 + 204 = 812. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 994 + 386 = 1380. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 57 × 42 = 2394. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 31 × 67 = 2077. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 988 + 375 = 1368. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 920 + 219 = 1139. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 47 × 38 = 1786. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 35 × 62 = 2170. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 99 × 96 = 9505. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 947 + 252 = 1199. Correct or wrong? (a) wrong (b) correct

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