Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 475 · 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: 39 × 75 = 2933. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 70 × 31 = 2170. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 12 × 21 = 252. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 363 + 726 = 1089. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 89 × 27 = 2398. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 27 × 64 = 1730. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 59 × 87 = 5133. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 389 + 214 = 603. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 71 × 83 = 5893. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 449 + 633 = 1079. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 20 × 35 = 700. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 52 × 14 = 735. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 36 × 82 = 2947. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 93 × 16 = 1488. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 123 + 979 = 1100. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 88 × 50 = 4394. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 59 × 30 = 1770. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 70 = 1676. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 668 + 488 = 1156. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 737 + 350 = 1083. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 55 × 41 = 2255. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 247 + 864 = 1111. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 845 + 637 = 1482. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 758 + 167 = 933. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 24 × 68 = 1634. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 867 + 472 = 1345. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 921 + 835 = 1750. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 83 × 49 = 4066. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 67 × 37 = 2479. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 71 × 87 = 6177. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 35 × 65 = 2280. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 23 × 27 = 620. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 465 + 328 = 800. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 330 + 423 = 761. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 55 × 32 = 1761. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 27 × 74 = 1998. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 91 × 87 = 7914. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 92 × 59 = 5428. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 96 × 78 = 7489. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 25 × 17 = 424. Correct or wrong? (a) correct (b) wrong

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