Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 299 · 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: 651 + 573 = 1224. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 33 × 79 = 2605. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 90 × 48 = 4320. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 14 × 83 = 1160. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 174 + 773 = 947. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 74 = 6505. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 69 × 97 = 6695. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 642 + 574 = 1216. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 91 × 64 = 5830. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 946 + 133 = 1079. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 686 + 144 = 837. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 172 + 635 = 807. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 35 × 21 = 734. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 435 + 882 = 1311. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 50 × 62 = 3102. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 36 × 82 = 2952. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 131 + 320 = 449. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 565 + 983 = 1548. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 33 × 47 = 1549. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 49 × 87 = 4270. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 816 + 466 = 1280. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 252 + 791 = 1045. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 680 + 398 = 1083. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 42 × 38 = 1595. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 323 + 906 = 1221. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 66 × 22 = 1448. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 37 = 1439. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 566 + 797 = 1364. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 54 × 14 = 748. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 28 × 72 = 2016. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 789 + 232 = 1024. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 884 + 307 = 1191. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 68 × 49 = 3340. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 51 × 61 = 3103. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 554 + 329 = 888. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 18 × 81 = 1451. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 74 × 31 = 2290. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 49 × 21 = 1029. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 58 × 78 = 4524. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 46 × 51 = 2343. Correct or wrong? (a) wrong (b) correct

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