Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 323 · 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: 246 + 682 = 933. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 529 + 781 = 1303. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 278 + 393 = 675. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 88 × 58 = 5110. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 623 + 726 = 1354. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 45 × 74 = 3324. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 39 × 49 = 1911. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 617 + 213 = 835. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 406 + 206 = 607. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 37 × 91 = 3375. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 412 + 797 = 1211. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 696 + 275 = 971. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 36 = 3168. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 74 × 34 = 2516. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 91 × 70 = 6370. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 588 + 206 = 787. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 62 × 74 = 4588. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 815 + 136 = 951. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 77 × 99 = 7624. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 17 × 37 = 629. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 84 × 56 = 4712. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 215 + 650 = 864. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 71 × 78 = 5538. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 58 = 5162. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 41 × 34 = 1394. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 317 + 288 = 605. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 181 + 507 = 688. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 42 × 77 = 3233. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 737 + 643 = 1372. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 828 + 594 = 1424. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 770 + 957 = 1727. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 78 × 30 = 2340. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 280 + 241 = 521. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 57 = 5187. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 21 × 45 = 945. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 885 + 224 = 1113. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 473 + 971 = 1436. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 16 × 42 = 672. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 22 × 91 = 2002. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 64 = 2304. Correct or wrong? (a) correct (b) wrong

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