Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 505 · 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: 284 + 969 = 1252. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 55 × 31 = 1706. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 30 × 29 = 873. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 850 + 325 = 1175. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 71 × 70 = 4964. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 774 + 467 = 1241. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 299 + 404 = 696. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 95 × 97 = 9215. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 192 + 999 = 1195. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 81 × 68 = 5508. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 506 + 665 = 1171. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 601 + 955 = 1556. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 35 × 96 = 3360. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 65 × 60 = 3900. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 340 + 918 = 1257. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 65 × 43 = 2795. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 315 + 447 = 762. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 35 × 96 = 3360. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 47 × 19 = 893. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 554 + 493 = 1054. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 219 + 582 = 805. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 703 + 463 = 1166. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 373 + 280 = 652. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 49 × 60 = 2940. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 66 × 93 = 6138. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 44 × 78 = 3432. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 599 + 595 = 1194. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 23 = 644. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 53 × 93 = 4925. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 905 + 492 = 1397. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 91 = 2457. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 84 × 63 = 5292. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 215 + 934 = 1149. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 554 + 938 = 1492. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 349 + 384 = 733. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 443 + 899 = 1345. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 653 + 652 = 1305. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 12 × 78 = 936. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 406 + 192 = 597. Correct or wrong? (a) wrong (b) correct

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