Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 366 · 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: 23 × 36 = 831. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 19 × 17 = 315. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 206 + 893 = 1099. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 182 + 353 = 540. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 36 × 35 = 1260. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 59 × 93 = 5487. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 84 × 24 = 2019. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 724 + 179 = 903. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 987 + 171 = 1151. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 68 × 62 = 4216. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 363 + 858 = 1221. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 23 × 29 = 667. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 387 + 479 = 866. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 58 = 1748. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 57 × 28 = 1596. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 682 + 834 = 1515. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 870 + 232 = 1108. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 747 + 560 = 1310. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 51 × 33 = 1682. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 91 × 13 = 1183. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 544 + 589 = 1132. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 964 + 843 = 1807. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 147 + 807 = 954. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 12 × 66 = 798. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 22 × 70 = 1539. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 159 + 808 = 967. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 35 × 49 = 1715. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 441 + 496 = 937. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 58 × 70 = 4060. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 339 + 418 = 752. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 420 + 673 = 1093. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 29 × 21 = 617. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 422 + 510 = 932. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 78 × 64 = 4992. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 162 + 694 = 851. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 99 × 29 = 2871. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 97 × 15 = 1456. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 51 = 1326. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 600 + 512 = 1104. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 91 × 66 = 6011. Correct or wrong? (a) correct (b) wrong

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