Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 198 · 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: 57 × 52 = 2964. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 297 + 422 = 719. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 28 × 76 = 2120. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 65 × 16 = 1048. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 426 + 312 = 738. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 282 + 527 = 809. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 63 × 93 = 5859. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 360 + 162 = 522. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 239 + 590 = 837. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 688 + 201 = 892. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 58 × 57 = 3304. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 460 + 190 = 648. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 69 × 36 = 2484. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 15 × 48 = 720. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 56 × 55 = 3080. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 24 × 80 = 1917. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 125 + 728 = 851. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 77 = 1919. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 932 + 261 = 1193. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 49 × 59 = 2891. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 41 × 55 = 2255. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 527 + 333 = 854. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 51 × 80 = 4080. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 77 = 6006. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 70 × 89 = 6230. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 502 + 927 = 1429. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 62 = 1922. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 517 + 243 = 760. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 440 + 495 = 935. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 955 + 759 = 1714. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 165 + 713 = 878. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 431 + 293 = 724. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 21 × 35 = 735. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 92 = 7728. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 65 × 94 = 6104. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 129 + 127 = 256. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 21 × 82 = 1718. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 93 × 18 = 1674. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 69 × 26 = 1794. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 247 + 166 = 413. Correct or wrong? (a) correct (b) wrong

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