Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 238 · 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: 33 × 77 = 2540. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 215 + 279 = 493. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 886 + 936 = 1822. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 40 × 18 = 720. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 14 × 78 = 1092. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 62 × 66 = 4092. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 29 × 84 = 2432. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 755 + 966 = 1717. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 83 × 36 = 2988. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 90 × 41 = 3690. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 28 × 38 = 1064. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 29 × 17 = 493. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 932 + 179 = 1112. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 97 × 60 = 5827. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 691 + 316 = 1004. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 38 × 72 = 2736. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 36 × 70 = 2520. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 141 + 830 = 979. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 79 × 31 = 2455. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 918 + 791 = 1701. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 271 + 608 = 879. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 591 + 147 = 738. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 60 × 30 = 1800. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 829 + 362 = 1191. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 53 × 32 = 1692. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 38 × 77 = 2926. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 793 + 319 = 1112. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 37 × 46 = 1702. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 765 + 327 = 1090. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 93 × 57 = 5308. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 39 × 98 = 3826. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 58 × 55 = 3193. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 493 + 850 = 1343. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 21 × 43 = 896. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 59 × 49 = 2893. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 565 + 344 = 903. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 14 × 17 = 238. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 335 + 502 = 842. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 964 + 591 = 1550. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 58 × 21 = 1218. Correct or wrong? (a) wrong (b) correct

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