Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 840 · 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: 84 × 36 = 3022. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 992 + 885 = 1877. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 50 × 78 = 3900. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 786 + 523 = 1308. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 90 × 21 = 1890. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 13 × 21 = 273. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 296 + 494 = 796. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 80 = 6960. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 56 × 76 = 4251. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 598 + 903 = 1503. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 20 = 520. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 425 + 519 = 952. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 363 + 646 = 1009. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 39 × 94 = 3666. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 97 × 87 = 8439. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 267 + 845 = 1112. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 491 + 372 = 861. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 57 × 25 = 1429. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 929 + 697 = 1620. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 14 × 13 = 182. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 23 × 36 = 826. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 84 × 71 = 5964. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 172 + 601 = 773. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 37 × 56 = 2072. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 87 × 32 = 2786. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 70 × 80 = 5607. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 399 + 272 = 679. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 775 + 507 = 1283. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 47 × 88 = 4136. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 56 = 5033. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 51 × 30 = 1530. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 25 = 552. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 76 × 75 = 5700. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 587 + 226 = 813. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 260 + 775 = 1035. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 56 × 85 = 4760. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 43 × 69 = 2965. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 73 × 88 = 6420. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 36 × 79 = 2844. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 600 + 784 = 1386. Correct or wrong? (a) wrong (b) correct

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