Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 861 · 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: 37 × 58 = 2152. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 127 + 514 = 641. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 859 + 679 = 1541. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 51 = 1278. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 349 + 870 = 1219. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 719 + 480 = 1199. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 874 + 541 = 1419. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 66 × 80 = 5280. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 70 × 86 = 6017. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 629 + 196 = 825. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 225 + 404 = 629. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 133 + 737 = 870. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 435 + 248 = 683. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 376 + 443 = 819. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 55 × 15 = 826. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 187 + 172 = 359. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 20 × 54 = 1080. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 133 + 765 = 898. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 81 × 76 = 6154. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 805 + 468 = 1271. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 51 × 59 = 3009. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 525 + 916 = 1441. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 821 + 792 = 1605. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 50 × 99 = 4955. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 69 × 40 = 2760. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 45 × 32 = 1440. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 71 × 18 = 1278. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 26 = 728. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 63 × 42 = 2643. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 88 × 26 = 2288. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 73 × 82 = 5991. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 818 + 623 = 1442. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 489 + 229 = 718. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 42 × 89 = 3737. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 364 + 127 = 491. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 89 × 93 = 8270. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 985 + 782 = 1769. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 16 = 226. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 297 + 963 = 1265. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 55 × 92 = 5060. Correct or wrong? (a) wrong (b) correct

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