Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 337 · 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: 627 + 362 = 985. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 76 × 29 = 2211. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 193 + 638 = 838. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 168 + 548 = 716. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 320 + 848 = 1169. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 93 × 25 = 2325. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 61 = 4206. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 402 + 687 = 1089. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 98 × 82 = 8036. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 51 × 50 = 2550. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 98 × 32 = 3144. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 19 = 290. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 52 × 13 = 682. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 872 + 471 = 1338. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 498 + 282 = 777. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 47 × 26 = 1227. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 34 = 1290. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 30 × 86 = 2582. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 457 + 744 = 1201. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 36 × 66 = 2368. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 211 + 713 = 918. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 15 × 79 = 1185. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 98 × 68 = 6666. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 780 + 560 = 1344. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 317 + 806 = 1123. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 390 + 822 = 1218. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 52 × 27 = 1411. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 627 + 944 = 1568. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 65 × 81 = 5265. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 37 × 38 = 1400. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 37 × 22 = 808. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 581 + 290 = 863. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 40 × 69 = 2760. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 76 × 25 = 1900. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 333 + 316 = 649. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 99 × 20 = 1980. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 741 + 508 = 1249. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 808 + 377 = 1189. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 42 × 35 = 1470. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 68 × 86 = 5848. Correct or wrong? (a) wrong (b) correct

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