Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 208 · 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: 58 × 42 = 2438. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 274 + 989 = 1262. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 794 + 485 = 1283. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 23 × 29 = 665. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 12 × 82 = 984. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 189 + 934 = 1120. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 50 = 1200. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 74 × 68 = 5032. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 52 × 82 = 4264. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 535 + 474 = 1012. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 30 × 23 = 690. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 555 + 851 = 1406. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 13 × 84 = 1087. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 35 × 51 = 1785. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 684 + 886 = 1566. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 143 + 567 = 710. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 176 + 515 = 691. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 78 × 88 = 6864. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 942 + 158 = 1100. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 310 + 489 = 799. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 819 + 187 = 1006. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 26 × 53 = 1378. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 882 + 157 = 1039. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 316 + 357 = 679. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 12 × 16 = 191. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 306 + 476 = 783. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 855 + 317 = 1172. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 761 + 703 = 1469. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 79 × 12 = 948. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 703 + 905 = 1616. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 550 + 685 = 1236. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 231 + 646 = 877. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 865 + 198 = 1063. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 29 × 60 = 1739. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 822 + 268 = 1090. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 27 × 63 = 1701. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 690 + 264 = 954. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 53 × 34 = 1802. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 20 = 1940. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 481 + 839 = 1320. Correct or wrong? (a) correct (b) wrong

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