Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 182 · 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: 566 + 538 = 1104. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 88 × 82 = 7218. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 64 × 55 = 3525. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 52 × 63 = 3282. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 39 × 91 = 3546. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 13 = 780. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 357 + 860 = 1217. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 488 + 357 = 845. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 35 × 65 = 2275. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 727 + 124 = 845. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 556 + 687 = 1242. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 776 + 239 = 1014. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 192 + 342 = 534. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 489 + 430 = 919. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 30 × 92 = 2754. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 45 × 27 = 1207. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 525 + 476 = 1001. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 815 + 266 = 1081. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 87 × 41 = 3574. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 989 + 459 = 1448. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 95 × 44 = 4180. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 95 × 71 = 6745. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 358 + 840 = 1195. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 28 × 77 = 2155. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 45 × 27 = 1212. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 385 + 832 = 1220. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 13 × 82 = 1070. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 883 + 510 = 1385. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 676 + 124 = 806. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 829 + 860 = 1689. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 89 × 46 = 4094. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 977 + 347 = 1324. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 40 × 13 = 512. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 487 + 814 = 1296. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 815 + 662 = 1477. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 49 = 1177. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 46 × 27 = 1242. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 942 + 988 = 1930. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 254 + 754 = 1008. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 822 + 735 = 1557. Correct or wrong? (a) wrong (b) correct

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