Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 396 · 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: 337 + 523 = 853. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 430 + 892 = 1322. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 49 × 27 = 1327. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 603 + 374 = 976. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 98 × 30 = 2936. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 77 × 62 = 4782. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 64 × 55 = 3520. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 76 × 62 = 4712. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 985 + 818 = 1805. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 58 × 70 = 4064. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 94 × 86 = 8087. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 76 × 46 = 3491. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 22 = 506. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 97 × 91 = 8827. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 847 + 866 = 1713. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 489 + 179 = 668. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 24 × 15 = 356. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 924 + 209 = 1140. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 77 × 51 = 3927. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 949 + 875 = 1824. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 18 × 85 = 1529. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 26 × 43 = 1118. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 543 + 749 = 1293. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 56 × 35 = 1957. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 22 × 19 = 418. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 406 + 917 = 1316. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 42 × 87 = 3654. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 21 × 66 = 1379. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 31 × 73 = 2270. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 83 = 2741. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 796 + 675 = 1471. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 38 × 49 = 1862. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 63 × 22 = 1384. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 95 × 82 = 7788. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 519 + 675 = 1194. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 41 × 85 = 3485. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 630 + 689 = 1319. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 30 = 547. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 313 + 772 = 1085. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 930 + 125 = 1052. Correct or wrong? (a) correct (b) wrong

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