Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 656 · 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: 12 × 72 = 864. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 37 × 82 = 3034. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 989 + 836 = 1825. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 47 × 16 = 755. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 96 × 25 = 2400. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 718 + 863 = 1589. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 84 × 26 = 2178. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 23 × 14 = 322. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 270 + 511 = 781. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 75 × 30 = 2251. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 286 + 914 = 1200. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 42 × 85 = 3570. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 543 + 927 = 1472. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 26 × 22 = 573. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 80 × 95 = 7595. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 570 + 780 = 1355. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 97 × 27 = 2619. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 750 + 987 = 1737. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 47 × 67 = 3149. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 66 × 77 = 5081. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 87 × 95 = 8265. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 574 + 737 = 1311. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 25 × 28 = 700. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 81 × 66 = 5354. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 54 × 69 = 3726. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 282 + 299 = 581. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 90 = 3508. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 62 × 63 = 3903. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 813 + 647 = 1460. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 68 × 33 = 2244. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 270 + 588 = 860. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 37 = 449. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 41 × 44 = 1804. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 557 + 281 = 830. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 131 + 320 = 451. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 730 + 243 = 973. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 96 × 80 = 7680. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 46 × 70 = 3215. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 57 × 67 = 3819. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 12 × 96 = 1152. Correct or wrong? (a) wrong (b) correct

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