Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 187 · 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: 817 + 420 = 1237. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 590 + 746 = 1336. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 650 + 580 = 1230. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 63 × 99 = 6245. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 76 × 77 = 5852. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 96 × 36 = 3451. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 77 × 85 = 6545. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 813 + 268 = 1081. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 571 + 890 = 1458. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 348 + 994 = 1342. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 38 × 72 = 2736. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 75 × 29 = 2181. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 986 + 728 = 1708. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 51 × 63 = 3209. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 477 + 927 = 1412. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 143 + 254 = 397. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 55 × 96 = 5273. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 27 × 81 = 2185. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 15 = 435. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 323 + 771 = 1093. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 928 + 352 = 1280. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 60 × 27 = 1614. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 761 + 207 = 968. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 124 + 195 = 319. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 52 × 26 = 1345. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 23 × 24 = 544. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 15 × 61 = 911. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 411 + 912 = 1317. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 13 × 65 = 845. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 460 + 319 = 777. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 50 × 62 = 3104. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 606 + 996 = 1604. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 269 + 474 = 743. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 302 + 583 = 885. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 281 + 304 = 585. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 891 + 983 = 1874. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 964 + 303 = 1270. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 897 + 978 = 1875. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 33 × 68 = 2239. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 19 × 43 = 817. Correct or wrong? (a) wrong (b) correct

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