Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 962 · 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: 460 + 524 = 984. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 676 + 272 = 954. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 28 × 46 = 1288. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 534 + 728 = 1262. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 77 × 16 = 1232. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 150 + 204 = 347. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 163 + 893 = 1056. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 382 + 623 = 998. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 24 × 38 = 912. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 79 × 40 = 3160. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 86 × 55 = 4733. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 43 × 31 = 1333. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 98 × 27 = 2639. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 192 + 733 = 925. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 57 × 45 = 2565. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 512 + 280 = 800. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 170 + 466 = 631. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 916 + 880 = 1796. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 602 + 838 = 1440. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 477 + 472 = 953. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 919 + 242 = 1156. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 727 + 952 = 1680. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 356 + 371 = 727. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 262 + 340 = 596. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 357 + 922 = 1278. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 136 + 747 = 890. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 74 × 77 = 5702. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 62 × 79 = 4901. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 527 + 947 = 1473. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 629 + 874 = 1502. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 534 + 530 = 1064. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 196 + 579 = 777. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 357 + 667 = 1028. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 16 × 85 = 1355. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 986 + 271 = 1262. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 537 + 410 = 945. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 42 × 30 = 1260. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 72 × 86 = 6192. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 57 × 19 = 1081. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 441 + 211 = 652. Correct or wrong? (a) wrong (b) correct

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