Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 333 · 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: 88 × 78 = 6863. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 55 × 59 = 3244. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 825 + 469 = 1294. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 50 × 30 = 1500. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 31 × 93 = 2881. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 72 × 95 = 6840. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 564 + 326 = 890. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 232 + 242 = 472. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 17 × 99 = 1681. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 54 = 1573. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 13 × 83 = 1079. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 88 × 78 = 6866. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 285 + 779 = 1069. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 963 + 887 = 1843. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 742 + 296 = 1039. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 54 × 50 = 2700. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 161 + 673 = 834. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 543 + 198 = 741. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 458 + 405 = 862. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 462 + 198 = 660. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 78 × 54 = 4212. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 697 + 349 = 1046. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 49 × 75 = 3675. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 526 + 312 = 838. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 640 + 785 = 1424. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 82 × 88 = 7223. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 554 + 616 = 1170. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 53 × 15 = 795. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 79 × 36 = 2844. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 326 + 208 = 534. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 90 × 94 = 8457. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 45 × 60 = 2702. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 251 + 966 = 1217. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 936 + 325 = 1261. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 33 × 57 = 1881. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 728 + 137 = 857. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 251 + 862 = 1115. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 260 + 290 = 550. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 400 + 585 = 986. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 832 + 244 = 1076. Correct or wrong? (a) correct (b) wrong

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