Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 737 · 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: 82 × 65 = 5332. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 853 + 177 = 1037. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 663 + 504 = 1170. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 40 × 96 = 3840. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 200 + 323 = 522. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 73 × 35 = 2555. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 51 × 73 = 3728. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 593 + 128 = 721. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 159 + 671 = 826. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 62 × 22 = 1364. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 639 + 479 = 1113. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 498 + 674 = 1172. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 885 + 696 = 1581. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 87 × 84 = 7310. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 24 × 47 = 1128. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 456 + 358 = 814. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 219 + 734 = 950. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 78 × 65 = 5070. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 96 × 70 = 6718. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 631 + 882 = 1515. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 222 + 790 = 1019. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 21 × 65 = 1357. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 324 + 198 = 518. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 58 = 1160. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 37 × 19 = 705. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 542 + 518 = 1060. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 467 + 472 = 939. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 955 + 851 = 1811. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 697 + 996 = 1693. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 94 × 32 = 3002. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 58 = 5278. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 93 × 58 = 5394. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 773 + 123 = 894. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 642 + 363 = 1010. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 30 × 54 = 1620. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 92 × 74 = 6804. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 640 + 696 = 1343. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 87 × 72 = 6269. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 33 × 70 = 2303. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 44 × 96 = 4219. Correct or wrong? (a) wrong (b) correct

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