Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 82 · 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: 86 × 95 = 8170. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 363 + 935 = 1301. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 70 × 66 = 4628. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 697 + 473 = 1170. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 79 × 75 = 5919. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 37 × 28 = 1036. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 82 × 56 = 4595. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 82 × 22 = 1809. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 69 × 70 = 4830. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 121 + 882 = 1003. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 61 × 16 = 968. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 18 × 99 = 1782. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 733 + 914 = 1654. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 35 × 28 = 980. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 935 + 133 = 1069. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 429 + 804 = 1233. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 29 × 34 = 993. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 26 × 92 = 2392. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 207 + 251 = 458. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 20 × 64 = 1272. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 98 × 95 = 9310. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 65 × 76 = 4932. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 21 × 62 = 1302. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 27 × 35 = 945. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 25 × 31 = 769. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 72 × 60 = 4313. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 803 + 657 = 1460. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 50 × 81 = 4050. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 382 + 721 = 1103. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 49 × 24 = 1176. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 91 × 84 = 7646. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 32 × 52 = 1667. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 39 × 28 = 1092. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 435 + 160 = 595. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 861 + 197 = 1058. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 20 × 54 = 1080. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 574 + 951 = 1527. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 69 × 13 = 890. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 18 × 67 = 1206. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 82 = 2380. Correct or wrong? (a) wrong (b) correct

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