Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 648 · 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: 85 × 13 = 1105. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 96 × 72 = 6912. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 12 × 86 = 1032. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 77 × 23 = 1774. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 763 + 330 = 1093. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 23 × 30 = 698. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 95 × 78 = 7410. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 14 × 22 = 313. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 958 + 718 = 1677. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 280 + 798 = 1082. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 79 × 41 = 3237. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 897 + 521 = 1421. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 789 + 849 = 1638. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 50 = 1850. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 191 + 344 = 535. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 824 + 344 = 1167. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 57 × 50 = 2850. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 214 + 748 = 962. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 90 × 71 = 6389. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 914 + 746 = 1658. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 868 + 705 = 1565. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 41 × 49 = 2009. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 35 = 2205. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 60 × 30 = 1800. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 33 × 44 = 1452. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 749 + 210 = 956. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 31 × 26 = 806. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 45 × 83 = 3735. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 34 × 37 = 1256. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 51 = 4590. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 77 × 71 = 5467. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 26 × 63 = 1633. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 39 = 2614. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 29 × 47 = 1364. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 69 × 72 = 4968. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 548 + 720 = 1268. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 359 + 364 = 716. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 528 + 284 = 812. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 21 × 73 = 1533. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 77 × 29 = 2240. Correct or wrong? (a) correct (b) wrong

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