Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 483 · 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: 46 × 32 = 1467. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 62 × 78 = 4836. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 515 + 348 = 862. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 24 × 85 = 2040. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 82 × 63 = 5167. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 211 + 294 = 502. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 598 + 451 = 1055. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 540 + 196 = 733. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 79 × 99 = 7815. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 31 × 74 = 2288. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 12 × 32 = 379. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 274 + 220 = 500. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 41 × 17 = 703. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 13 × 73 = 942. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 90 = 4771. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 18 × 25 = 450. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 95 × 95 = 9023. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 892 + 185 = 1085. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 631 + 185 = 816. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 45 × 82 = 3685. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 831 + 383 = 1218. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 50 × 25 = 1250. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 946 + 359 = 1298. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 207 + 567 = 775. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 56 × 59 = 3302. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 147 + 918 = 1065. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 48 × 44 = 2112. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 18 × 80 = 1443. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 378 + 464 = 836. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 790 + 439 = 1228. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 195 + 830 = 1025. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 675 + 621 = 1296. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 13 × 20 = 260. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 658 + 458 = 1116. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 87 × 56 = 4869. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 76 × 94 = 7144. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 600 + 670 = 1276. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 469 + 415 = 884. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 751 + 946 = 1697. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 235 + 214 = 447. Correct or wrong? (a) wrong (b) correct

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