Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 498 · 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: 781 + 251 = 1033. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 77 × 91 = 7009. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 19 × 36 = 689. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 607 + 315 = 922. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 27 × 67 = 1809. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 204 + 723 = 922. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 29 × 32 = 928. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 705 + 956 = 1661. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 67 × 93 = 6231. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 50 = 4200. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 36 × 77 = 2772. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 793 + 324 = 1109. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 313 + 204 = 517. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 28 × 29 = 813. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 66 × 88 = 5811. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 32 × 34 = 1088. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 82 × 23 = 1886. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 471 + 427 = 898. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 72 = 4536. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 360 + 875 = 1241. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 88 × 27 = 2384. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 34 × 85 = 2887. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 799 + 479 = 1283. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 31 × 90 = 2787. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 594 + 217 = 811. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 44 × 25 = 1100. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 409 + 472 = 881. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 491 + 622 = 1113. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 727 + 282 = 1008. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 80 × 51 = 4086. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 244 + 169 = 408. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 315 + 452 = 771. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 23 × 67 = 1548. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 88 × 65 = 5715. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 399 + 918 = 1317. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 350 + 849 = 1195. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 74 × 94 = 6960. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 770 + 146 = 914. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 985 + 375 = 1360. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 666 + 973 = 1639. Correct or wrong? (a) wrong (b) correct

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