Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 357 · 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: 31 × 93 = 2886. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 41 = 2665. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 531 + 435 = 966. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 72 × 19 = 1360. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 61 × 82 = 5002. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 702 + 827 = 1532. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 96 × 16 = 1531. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 51 × 85 = 4338. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 123 + 241 = 364. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 50 × 61 = 3050. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 95 = 2470. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 433 + 594 = 1027. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 396 + 218 = 614. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 27 × 73 = 1971. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 844 + 137 = 981. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 64 × 31 = 1988. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 20 × 19 = 379. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 778 + 212 = 993. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 73 × 57 = 4161. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 73 × 67 = 4885. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 324 + 361 = 685. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 152 + 491 = 643. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 60 × 46 = 2760. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 45 = 3375. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 27 × 70 = 1890. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 70 × 47 = 3290. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 62 × 87 = 5391. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 30 × 43 = 1290. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 538 + 807 = 1345. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 295 + 299 = 594. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 62 × 81 = 5022. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 574 + 337 = 911. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 14 × 28 = 388. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 89 × 50 = 4446. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 15 × 85 = 1275. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 347 + 721 = 1073. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 831 + 229 = 1060. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 239 + 755 = 994. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 49 × 24 = 1176. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 557 + 680 = 1232. Correct or wrong? (a) correct (b) wrong

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