Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 736 · 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: 69 × 64 = 4423. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 95 × 33 = 3137. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 914 + 724 = 1637. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 27 = 1327. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 26 × 27 = 697. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 257 + 592 = 852. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 850 + 696 = 1544. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 28 = 2204. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 869 + 342 = 1217. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 78 × 41 = 3198. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 497 + 404 = 901. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 83 × 12 = 999. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 84 = 4620. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 38 = 801. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 490 + 933 = 1423. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 59 × 97 = 5722. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 43 × 84 = 3619. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 726 + 252 = 978. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 49 × 80 = 3920. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 456 + 236 = 684. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 40 × 59 = 2361. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 77 × 17 = 1309. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 609 + 768 = 1377. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 812 + 844 = 1656. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 16 × 34 = 544. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 447 + 897 = 1344. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 995 + 576 = 1571. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 37 × 76 = 2815. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 34 × 88 = 2993. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 26 × 66 = 1715. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 351 + 825 = 1176. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 83 × 34 = 2818. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 26 × 27 = 709. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 13 = 403. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 994 + 682 = 1676. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 41 × 40 = 1646. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 651 + 980 = 1631. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 425 + 923 = 1352. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 52 × 25 = 1296. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 67 × 33 = 2219. Correct or wrong? (a) wrong (b) correct

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