Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 788 · 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: 21 × 30 = 630. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 216 + 997 = 1209. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 55 × 56 = 3080. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 160 + 490 = 650. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 796 + 560 = 1356. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 85 × 14 = 1190. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 268 + 888 = 1162. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 520 + 382 = 904. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 84 × 16 = 1342. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 40 × 21 = 836. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 846 + 420 = 1266. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 17 = 1306. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 88 × 59 = 5190. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 88 × 68 = 5984. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 27 × 59 = 1593. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 791 + 424 = 1215. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 38 × 49 = 1862. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 37 × 63 = 2324. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 95 = 2760. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 30 × 13 = 395. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 400 + 333 = 733. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 345 + 517 = 863. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 976 + 159 = 1127. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 93 × 26 = 2418. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 369 + 293 = 666. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 69 × 91 = 6279. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 41 × 79 = 3240. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 652 + 979 = 1631. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 433 + 157 = 587. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 78 × 55 = 4290. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 713 + 312 = 1025. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 87 = 2877. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 36 × 20 = 727. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 905 + 341 = 1246. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 142 + 152 = 301. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 77 × 87 = 6701. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 82 × 28 = 2289. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 58 × 86 = 4989. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 491 + 316 = 808. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 516 + 937 = 1461. Correct or wrong? (a) wrong (b) correct

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