Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 128 · 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: 38 × 34 = 1300. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 45 × 92 = 4145. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 495 + 230 = 725. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 79 × 29 = 2286. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 489 + 170 = 659. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 590 + 277 = 867. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 27 × 21 = 567. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 16 × 49 = 784. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 47 × 26 = 1222. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 183 + 422 = 605. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 48 × 33 = 1584. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 177 + 180 = 362. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 382 + 788 = 1172. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 215 + 393 = 608. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 92 = 4321. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 88 × 39 = 3433. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 40 × 79 = 3158. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 749 + 942 = 1689. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 889 + 500 = 1389. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 630 + 347 = 980. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 173 + 221 = 394. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 33 × 30 = 990. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 579 + 927 = 1500. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 208 + 330 = 543. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 29 × 60 = 1732. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 99 × 52 = 5148. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 333 + 283 = 616. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 57 × 16 = 912. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 62 × 32 = 1977. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 329 + 277 = 606. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 66 × 33 = 2177. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 353 + 389 = 749. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 47 × 82 = 3854. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 844 + 411 = 1258. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 13 × 72 = 936. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 184 + 746 = 930. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 430 + 634 = 1068. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 96 × 46 = 4410. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 89 × 56 = 4984. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 86 × 14 = 1198. Correct or wrong? (a) wrong (b) correct

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