Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 433 · 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: 797 + 968 = 1765. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 71 × 75 = 5325. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 126 + 265 = 399. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 56 × 98 = 5488. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 57 × 87 = 4952. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 98 × 21 = 2058. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 245 + 686 = 939. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 65 × 89 = 5782. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 88 × 20 = 1767. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 971 + 904 = 1875. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 728 + 443 = 1171. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 750 + 267 = 1017. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 199 + 367 = 574. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 539 + 751 = 1290. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 768 + 922 = 1696. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 602 + 756 = 1358. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 928 + 938 = 1864. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 88 × 89 = 7825. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 85 × 42 = 3570. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 905 + 190 = 1095. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 788 + 448 = 1236. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 503 + 834 = 1337. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 62 × 80 = 4962. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 656 + 719 = 1375. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 866 + 474 = 1343. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 95 × 95 = 9025. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 69 = 1305. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 79 × 49 = 3864. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 74 × 82 = 6068. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 199 + 193 = 384. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 35 × 75 = 2633. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 92 × 47 = 4322. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 74 × 19 = 1404. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 547 + 972 = 1519. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 83 = 1583. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 23 × 35 = 805. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 13 = 244. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 547 + 302 = 849. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 972 + 652 = 1624. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 78 × 13 = 1014. Correct or wrong? (a) wrong (b) correct

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