Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 858 · 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: 945 + 166 = 1111. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 83 × 42 = 3486. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 46 × 64 = 2947. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 27 × 25 = 669. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 583 + 242 = 820. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 228 + 419 = 649. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 21 = 378. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 555 + 139 = 692. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 172 + 321 = 493. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 61 × 73 = 4453. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 276 + 813 = 1081. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 366 + 414 = 780. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 938 + 300 = 1241. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 723 + 361 = 1084. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 44 × 33 = 1452. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 17 = 527. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 21 × 82 = 1722. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 71 × 89 = 6326. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 83 = 1495. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 976 + 378 = 1361. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 967 + 369 = 1336. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 90 × 42 = 3777. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 674 + 353 = 1027. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 782 + 889 = 1677. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 48 × 47 = 2259. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 555 + 719 = 1274. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 130 + 423 = 553. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 401 + 303 = 712. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 891 + 428 = 1319. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 64 × 44 = 2816. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 68 = 1020. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 85 × 35 = 2970. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 42 × 72 = 3024. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 24 × 59 = 1416. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 683 + 176 = 859. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 358 + 450 = 808. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 27 × 27 = 735. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 725 + 840 = 1567. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 65 × 32 = 2087. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 62 × 13 = 808. Correct or wrong? (a) wrong (b) correct

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