Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 603 · 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: 77 × 15 = 1156. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 207 + 892 = 1099. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 33 = 1881. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 13 × 71 = 928. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 249 + 784 = 1026. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 33 × 13 = 429. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 55 = 3795. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 26 × 71 = 1843. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 43 × 77 = 3319. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 62 × 23 = 1426. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 94 × 75 = 7056. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 60 × 68 = 4080. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 64 × 17 = 1088. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 543 + 865 = 1408. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 123 + 216 = 338. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 91 × 15 = 1359. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 546 + 125 = 679. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 949 + 157 = 1108. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 519 + 375 = 894. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 13 × 59 = 767. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 239 + 136 = 381. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 87 × 19 = 1653. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 250 + 893 = 1138. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 24 × 70 = 1676. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 603 + 167 = 770. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 67 × 91 = 6097. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 54 × 99 = 5346. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 21 × 51 = 1071. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 726 + 626 = 1348. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 209 + 193 = 402. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 47 × 26 = 1222. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 28 × 28 = 778. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 804 + 269 = 1073. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 55 × 43 = 2364. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 16 × 85 = 1362. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 27 = 1753. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 71 × 20 = 1420. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 932 + 829 = 1759. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 455 + 870 = 1325. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 61 × 39 = 2379. Correct or wrong? (a) correct (b) wrong

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