Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 171 · 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: 52 × 65 = 3380. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 42 × 86 = 3605. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 21 × 97 = 2037. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 406 + 378 = 778. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 39 = 3116. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 51 × 30 = 1529. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 389 + 178 = 571. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 12 × 95 = 1140. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 276 + 343 = 619. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 850 + 423 = 1274. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 72 × 25 = 1797. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 810 + 849 = 1659. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 28 × 31 = 868. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 91 × 94 = 8554. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 44 × 54 = 2374. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 91 × 86 = 7826. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 69 × 15 = 1035. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 72 × 91 = 6560. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 20 = 360. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 424 + 200 = 627. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 842 + 713 = 1558. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 26 × 29 = 752. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 12 = 762. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 57 × 71 = 4047. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 315 + 646 = 961. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 628 + 418 = 1046. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 220 + 594 = 814. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 14 × 61 = 846. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 91 × 62 = 5642. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 318 + 626 = 948. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 366 + 722 = 1095. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 58 = 5286. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 407 + 297 = 704. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 37 × 22 = 814. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 65 × 14 = 913. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 77 × 13 = 1005. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 661 + 272 = 931. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 98 × 43 = 4214. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 644 + 930 = 1571. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 177 + 896 = 1073. Correct or wrong? (a) wrong (b) correct

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