Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 575 · 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: 878 + 657 = 1537. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 231 + 592 = 823. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 420 + 559 = 979. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 58 × 47 = 2726. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 16 = 774. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 97 × 34 = 3297. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 87 × 49 = 4255. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 358 + 168 = 519. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 66 × 85 = 5610. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 887 + 781 = 1662. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 45 × 16 = 720. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 196 + 363 = 567. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 84 = 5208. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 730 + 782 = 1512. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 38 × 69 = 2620. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 96 × 66 = 6338. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 253 + 288 = 542. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 933 + 394 = 1321. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 826 + 711 = 1537. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 80 × 48 = 3832. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 362 + 766 = 1134. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 194 + 187 = 381. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 75 × 38 = 2850. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 868 + 396 = 1261. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 710 + 717 = 1425. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 37 × 42 = 1554. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 33 × 81 = 2668. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 65 = 6044. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 54 × 72 = 3888. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 576 + 217 = 801. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 198 + 745 = 943. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 61 × 79 = 4819. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 933 + 881 = 1820. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 441 + 249 = 690. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 81 × 45 = 3645. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 88 × 71 = 6244. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 80 × 61 = 4880. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 377 + 722 = 1099. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 30 × 67 = 2010. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 666 + 537 = 1203. Correct or wrong? (a) correct (b) wrong

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