Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 564 · 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: 47 × 14 = 658. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 646 + 278 = 917. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 30 × 28 = 840. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 563 + 920 = 1483. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 592 + 309 = 901. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 293 + 666 = 966. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 29 × 95 = 2755. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 65 × 60 = 3900. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 37 × 95 = 3520. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 220 + 992 = 1212. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 694 + 338 = 1038. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 82 × 23 = 1878. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 17 × 76 = 1285. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 77 × 33 = 2549. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 628 + 536 = 1164. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 13 × 78 = 1022. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 667 + 205 = 872. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 82 × 34 = 2788. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 51 × 71 = 3627. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 51 × 58 = 2950. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 96 × 74 = 7096. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 98 × 58 = 5684. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 98 = 1961. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 586 + 328 = 921. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 696 + 748 = 1444. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 38 × 71 = 2702. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 423 + 231 = 653. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 70 × 96 = 6720. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 92 × 94 = 8648. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 84 × 74 = 6208. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 38 × 21 = 798. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 93 × 66 = 6137. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 66 = 4429. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 42 × 39 = 1637. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 65 × 17 = 1103. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 915 + 468 = 1383. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 158 + 499 = 657. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 847 + 146 = 992. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 53 × 57 = 3020. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 575 + 575 = 1158. Correct or wrong? (a) wrong (b) correct

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