Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 178 · 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: 65 × 12 = 780. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 52 × 70 = 3636. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 55 × 32 = 1765. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 183 + 568 = 751. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 52 × 38 = 1976. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 298 + 699 = 997. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 28 × 52 = 1456. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 80 × 43 = 3440. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 685 + 148 = 833. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 615 + 287 = 902. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 76 = 4180. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 460 + 260 = 720. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 99 × 14 = 1386. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 292 + 700 = 992. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 591 + 730 = 1321. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 536 + 371 = 913. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 465 + 869 = 1334. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 48 × 78 = 3747. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 26 × 40 = 1045. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 94 × 36 = 3384. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 903 + 650 = 1545. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 348 + 384 = 737. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 948 + 232 = 1180. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 574 + 167 = 741. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 23 × 38 = 873. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 87 × 64 = 5568. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 52 × 46 = 2387. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 78 × 77 = 6006. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 94 × 48 = 4512. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 61 = 1769. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 63 = 1764. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 68 = 4762. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 22 × 88 = 1936. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 172 + 506 = 678. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 334 + 463 = 797. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 44 × 21 = 926. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 73 × 89 = 6497. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 99 × 30 = 2962. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 96 × 91 = 8740. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 40 × 18 = 725. Correct or wrong? (a) wrong (b) correct

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