Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 412 · 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: 12 × 30 = 360. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 76 × 50 = 3794. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 379 + 506 = 892. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 502 + 181 = 683. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 727 + 181 = 908. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 18 × 69 = 1242. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 80 × 94 = 7520. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 146 + 948 = 1094. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 76 × 98 = 7448. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 43 × 84 = 3612. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 750 + 439 = 1189. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 82 × 18 = 1472. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 99 × 35 = 3470. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 757 + 938 = 1695. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 493 + 735 = 1225. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 66 × 84 = 5544. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 333 + 381 = 715. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 979 + 292 = 1271. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 897 + 244 = 1141. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 506 + 351 = 857. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 18 × 64 = 1153. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 34 = 1259. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 805 + 350 = 1150. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 426 + 178 = 601. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 881 + 319 = 1200. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 998 + 746 = 1738. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 94 × 18 = 1692. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 94 × 63 = 5930. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 504 + 493 = 997. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 84 × 93 = 7812. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 827 + 188 = 1015. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 15 × 94 = 1410. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 37 × 26 = 962. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 20 × 87 = 1738. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 632 + 849 = 1481. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 80 × 54 = 4325. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 318 + 621 = 939. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 94 × 53 = 4982. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 554 + 869 = 1423. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 173 + 588 = 761. Correct or wrong? (a) wrong (b) correct

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