Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 879 · 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: 66 × 74 = 4884. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 621 + 550 = 1168. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 87 × 90 = 7829. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 80 × 90 = 7194. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 386 + 640 = 1027. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 411 + 427 = 834. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 386 + 944 = 1335. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 327 + 185 = 520. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 31 × 33 = 1031. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 98 × 78 = 7644. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 19 × 73 = 1387. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 230 + 970 = 1198. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 77 × 48 = 3696. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 161 + 518 = 672. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 89 × 48 = 4266. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 91 × 15 = 1365. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 16 × 24 = 384. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 78 × 51 = 3978. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 224 + 464 = 688. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 867 + 554 = 1421. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 632 + 474 = 1103. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 94 × 74 = 6950. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 68 × 67 = 4564. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 22 × 66 = 1460. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 139 + 406 = 545. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 752 + 547 = 1299. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 40 × 51 = 2040. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 281 + 353 = 638. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 56 × 86 = 4816. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 164 + 820 = 978. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 212 + 247 = 459. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 143 + 971 = 1120. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 18 × 65 = 1170. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 861 + 300 = 1161. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 77 × 89 = 6860. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 13 × 60 = 778. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 99 × 56 = 5541. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 97 × 30 = 2910. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 444 + 271 = 720. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 81 × 47 = 3799. Correct or wrong? (a) correct (b) wrong

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