Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 107 · 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: 36 × 88 = 3168. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 908 + 151 = 1059. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 36 × 17 = 612. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 397 + 959 = 1352. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 29 × 77 = 2231. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 69 × 46 = 3174. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 697 + 338 = 1040. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 970 + 646 = 1616. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 94 × 94 = 8836. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 996 + 829 = 1825. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 468 + 892 = 1360. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 801 + 396 = 1197. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 52 = 1190. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 705 + 549 = 1257. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 650 + 680 = 1331. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 120 + 744 = 864. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 56 × 42 = 2352. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 72 × 20 = 1442. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 97 × 79 = 7664. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 936 + 138 = 1079. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 507 + 284 = 791. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 52 × 49 = 2548. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 22 = 338. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 60 × 54 = 3244. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 46 × 52 = 2393. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 58 × 81 = 4698. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 47 × 37 = 1739. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 964 + 867 = 1831. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 178 + 214 = 392. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 478 + 498 = 976. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 56 × 15 = 840. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 494 + 342 = 831. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 57 × 77 = 4385. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 512 + 287 = 799. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 50 × 87 = 4356. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 332 + 546 = 876. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 700 + 206 = 906. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 38 = 3570. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 31 = 406. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 78 × 81 = 6318. Correct or wrong? (a) correct (b) wrong

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