Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 623 · 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: 699 + 165 = 864. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 64 × 50 = 3200. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 63 × 23 = 1449. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 683 + 656 = 1339. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 714 + 246 = 960. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 765 + 377 = 1142. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 78 × 28 = 2184. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 630 + 472 = 1102. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 81 × 73 = 5905. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 98 × 30 = 2940. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 42 × 51 = 2141. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 237 + 459 = 696. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 345 + 441 = 786. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 40 = 724. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 410 + 389 = 804. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 963 + 845 = 1803. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 14 × 13 = 182. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 50 × 72 = 3600. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 331 + 224 = 555. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 56 × 30 = 1672. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 73 × 61 = 4453. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 85 × 96 = 8160. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 35 = 598. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 344 + 125 = 477. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 658 + 329 = 982. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 927 + 503 = 1430. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 47 × 23 = 1075. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 630 + 385 = 1016. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 922 + 125 = 1047. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 326 + 237 = 567. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 28 × 29 = 808. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 347 + 254 = 601. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 89 × 69 = 6145. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 192 + 650 = 842. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 36 × 89 = 3204. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 92 × 80 = 7357. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 30 × 34 = 1020. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 70 × 74 = 5186. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 89 × 50 = 4450. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 803 + 242 = 1043. Correct or wrong? (a) wrong (b) correct

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