Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 305 · 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: 96 × 67 = 6432. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 317 + 787 = 1101. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 77 = 1236. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 54 × 61 = 3294. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 539 + 928 = 1467. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 354 + 516 = 870. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 74 × 14 = 1036. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 52 × 50 = 2600. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 45 × 89 = 4005. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 93 × 91 = 8459. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 79 × 45 = 3555. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 83 × 32 = 2661. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 930 + 361 = 1291. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 83 × 90 = 7469. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 63 × 73 = 4599. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 92 × 50 = 4600. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 721 + 430 = 1151. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 260 + 889 = 1156. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 17 × 64 = 1088. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 235 + 308 = 543. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 819 + 398 = 1222. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 286 + 718 = 1004. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 73 × 24 = 1752. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 34 × 79 = 2686. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 96 = 2976. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 33 × 27 = 891. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 42 × 64 = 2688. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 168 + 498 = 666. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 637 + 971 = 1609. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 71 × 28 = 1991. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 44 × 15 = 660. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 44 × 65 = 2863. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 89 = 8277. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 27 × 97 = 2614. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 790 + 882 = 1672. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 83 = 5070. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 876 + 502 = 1378. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 443 + 351 = 790. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 478 + 138 = 622. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 260 + 570 = 830. Correct or wrong? (a) correct (b) wrong

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