Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 381 · 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: 17 × 79 = 1338. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 308 + 686 = 996. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 41 × 24 = 984. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 302 + 983 = 1285. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 16 × 20 = 320. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 49 × 34 = 1662. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 627 + 615 = 1242. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 93 × 81 = 7525. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 56 = 1339. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 99 × 62 = 6138. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 93 × 22 = 2049. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 832 + 219 = 1051. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 42 × 73 = 3073. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 89 × 20 = 1788. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 71 × 96 = 6816. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 355 + 613 = 968. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 86 × 50 = 4300. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 270 + 280 = 550. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 79 × 65 = 5135. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 70 × 47 = 3287. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 572 + 796 = 1368. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 39 = 1599. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 762 + 542 = 1304. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 68 × 53 = 3597. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 989 + 525 = 1508. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 15 × 32 = 480. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 83 × 67 = 5563. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 731 + 150 = 883. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 259 + 285 = 536. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 485 + 689 = 1178. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 60 × 52 = 3120. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 30 × 20 = 596. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 87 × 56 = 4872. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 153 + 652 = 810. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 63 × 48 = 3024. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 308 + 152 = 462. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 271 + 823 = 1089. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 885 + 420 = 1305. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 53 × 80 = 4240. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 60 × 66 = 3960. Correct or wrong? (a) wrong (b) correct

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