Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 689 · 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: 21 × 97 = 2033. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 564 + 577 = 1141. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 65 × 53 = 3446. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 38 × 52 = 1976. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 674 + 673 = 1351. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 730 + 501 = 1234. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 86 × 22 = 1892. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 28 × 41 = 1148. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 61 × 88 = 5368. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 37 × 20 = 737. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 74 × 16 = 1184. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 31 = 2263. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 46 × 68 = 3127. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 55 × 65 = 3575. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 844 + 793 = 1644. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 47 × 36 = 1695. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 26 × 41 = 1066. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 45 × 70 = 3156. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 719 + 819 = 1538. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 15 × 64 = 960. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 559 + 586 = 1145. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 36 × 62 = 2232. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 45 × 75 = 3375. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 787 + 706 = 1493. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 77 × 76 = 5852. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 50 × 89 = 4446. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 26 × 68 = 1773. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 16 × 18 = 288. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 85 = 1445. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 35 × 14 = 482. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 34 × 58 = 1979. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 72 × 83 = 5976. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 71 × 45 = 3188. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 26 × 84 = 2188. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 292 + 354 = 646. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 16 = 1216. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 416 + 921 = 1337. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 75 × 23 = 1732. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 158 + 207 = 371. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 25 = 1425. Correct or wrong? (a) correct (b) wrong

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