Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 829 · 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: 45 × 75 = 3370. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 483 + 214 = 697. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 53 × 17 = 902. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 75 = 2250. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 71 × 45 = 3195. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 57 × 16 = 915. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 395 + 625 = 1020. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 32 × 91 = 2905. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 55 × 79 = 4339. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 71 = 2272. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 726 + 721 = 1447. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 91 × 76 = 6916. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 80 × 26 = 2083. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 687 + 817 = 1511. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 29 = 1768. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 970 + 556 = 1518. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 32 = 1696. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 22 × 31 = 682. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 898 + 246 = 1144. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 20 × 96 = 1920. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 924 + 487 = 1405. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 708 + 624 = 1332. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 55 × 51 = 2810. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 35 × 50 = 1755. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 30 × 54 = 1620. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 277 + 885 = 1155. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 183 + 440 = 623. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 387 + 375 = 762. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 268 + 799 = 1073. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 37 × 36 = 1337. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 73 × 19 = 1387. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 890 + 142 = 1040. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 32 × 48 = 1544. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 773 + 936 = 1712. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 577 + 796 = 1373. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 200 + 823 = 1023. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 90 × 61 = 5491. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 810 + 573 = 1385. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 574 + 309 = 887. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 52 × 89 = 4629. Correct or wrong? (a) wrong (b) correct

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