Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 887 · 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 × 41 = 1933. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 525 + 620 = 1148. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 69 × 50 = 3442. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 86 × 58 = 4988. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 228 + 438 = 666. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 593 + 748 = 1336. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 45 × 23 = 1029. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 72 × 89 = 6408. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 27 × 82 = 2214. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 66 × 62 = 4099. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 295 + 532 = 827. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 63 × 49 = 3085. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 60 × 12 = 728. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 42 × 12 = 504. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 81 × 15 = 1215. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 75 × 34 = 2550. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 77 × 20 = 1536. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 122 + 550 = 672. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 764 + 444 = 1208. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 260 + 599 = 863. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 18 × 35 = 630. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 22 = 281. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 74 × 65 = 4810. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 209 + 827 = 1031. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 44 × 31 = 1364. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 16 × 15 = 240. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 29 × 66 = 1918. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 30 × 46 = 1381. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 27 × 31 = 833. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 46 × 37 = 1702. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 14 × 95 = 1330. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 64 × 43 = 2752. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 39 × 63 = 2463. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 71 × 80 = 5672. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 55 = 2039. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 27 = 2492. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 64 × 87 = 5568. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 40 × 95 = 3800. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 17 × 20 = 348. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 45 × 85 = 3825. Correct or wrong? (a) wrong (b) correct

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