Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 56 · 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: 78 × 82 = 6392. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 45 × 89 = 4005. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 193 + 272 = 461. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 812 + 233 = 1049. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 710 + 566 = 1276. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 371 + 713 = 1084. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 40 × 84 = 3360. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 275 + 542 = 817. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 57 × 97 = 5525. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 146 + 179 = 323. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 679 + 158 = 831. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 423 + 549 = 972. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 47 = 2916. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 66 × 49 = 3227. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 986 + 328 = 1316. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 642 + 645 = 1286. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 62 × 99 = 6138. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 18 = 776. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 586 + 740 = 1326. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 89 × 37 = 3293. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 32 × 46 = 1476. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 56 × 68 = 3811. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 99 × 17 = 1683. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 50 × 17 = 856. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 88 × 32 = 2823. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 926 + 213 = 1136. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 27 = 373. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 562 + 909 = 1477. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 28 × 67 = 1871. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 846 + 160 = 1006. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 50 × 30 = 1500. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 94 × 16 = 1512. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 98 = 6569. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 692 + 178 = 871. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 498 + 498 = 996. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 987 + 739 = 1724. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 81 × 86 = 6966. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 446 + 124 = 570. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 267 + 305 = 577. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 454 + 768 = 1222. Correct or wrong? (a) wrong (b) correct

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