Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 999 · 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: 334 + 225 = 561. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 73 × 44 = 3212. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 81 × 15 = 1215. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 36 × 22 = 792. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 69 × 33 = 2277. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 48 × 85 = 4086. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 59 × 85 = 5015. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 338 + 174 = 512. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 21 × 95 = 1995. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 607 + 291 = 898. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 408 + 876 = 1284. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 852 + 279 = 1125. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 79 × 71 = 5609. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 67 × 76 = 5092. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 14 = 280. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 59 × 34 = 2006. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 98 × 44 = 4309. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 142 + 253 = 393. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 663 + 658 = 1321. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 245 + 164 = 409. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 868 + 735 = 1603. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 58 × 96 = 5568. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 47 = 605. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 50 × 92 = 4600. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 20 × 47 = 940. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 96 × 13 = 1241. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 630 + 434 = 1064. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 286 + 387 = 679. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 468 + 435 = 903. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 85 = 2463. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 99 × 15 = 1485. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 15 × 88 = 1317. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 645 + 241 = 886. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 88 × 95 = 8354. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 863 + 177 = 1043. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 970 + 989 = 1959. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 493 + 711 = 1198. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 25 × 80 = 2000. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 72 × 32 = 2304. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 145 + 599 = 748. Correct or wrong? (a) wrong (b) correct

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