Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 892 · 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: 47 × 62 = 2909. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 765 + 425 = 1190. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 875 + 168 = 1051. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 86 × 75 = 6450. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 20 × 94 = 1880. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 53 × 29 = 1537. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 596 + 780 = 1377. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 46 × 32 = 1480. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 217 + 266 = 476. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 30 = 1770. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 31 × 70 = 2170. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 375 + 234 = 609. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 142 + 322 = 460. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 405 + 855 = 1260. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 62 × 22 = 1363. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 87 × 42 = 3660. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 97 × 12 = 1164. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 19 × 23 = 437. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 794 + 934 = 1734. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 85 × 17 = 1445. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 912 + 454 = 1366. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 502 + 657 = 1154. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 399 + 316 = 713. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 28 × 64 = 1785. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 476 + 742 = 1218. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 76 × 17 = 1292. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 36 = 3098. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 736 + 854 = 1590. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 217 + 373 = 590. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 211 + 571 = 782. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 32 = 480. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 83 × 35 = 2905. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 517 + 373 = 890. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 14 × 18 = 247. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 67 × 23 = 1541. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 706 + 451 = 1157. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 928 + 809 = 1737. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 55 × 34 = 1869. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 333 + 538 = 871. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 97 × 93 = 9024. Correct or wrong? (a) wrong (b) correct

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