Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 597 · 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: 523 + 887 = 1407. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 18 × 22 = 400. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 31 × 60 = 1860. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 57 × 85 = 4847. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 130 + 215 = 348. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 833 + 793 = 1626. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 84 × 63 = 5292. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 96 × 81 = 7776. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 457 + 404 = 862. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 16 × 53 = 848. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 75 × 70 = 5250. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 53 × 49 = 2594. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 341 + 136 = 477. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 70 × 99 = 6930. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 145 + 625 = 770. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 229 + 430 = 659. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 44 × 89 = 3916. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 60 = 1442. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 96 × 93 = 8928. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 73 × 46 = 3366. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 904 + 475 = 1379. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 33 × 94 = 3102. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 377 + 995 = 1373. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 49 × 67 = 3291. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 61 × 53 = 3233. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 80 × 20 = 1603. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 65 = 2860. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 881 + 490 = 1371. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 42 × 61 = 2562. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 72 × 68 = 4904. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 303 + 831 = 1140. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 445 + 879 = 1324. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 401 + 464 = 858. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 51 × 69 = 3519. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 98 × 40 = 3920. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 94 × 49 = 4606. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 824 + 582 = 1410. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 70 × 16 = 1120. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 59 × 43 = 2537. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 20 × 83 = 1660. Correct or wrong? (a) correct (b) wrong

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