Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 778 · 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 × 20 = 240. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 99 × 14 = 1387. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 19 × 25 = 473. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 20 × 84 = 1680. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 68 × 81 = 5508. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 203 + 136 = 339. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 82 × 94 = 7714. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 308 + 493 = 801. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 790 + 343 = 1133. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 81 × 75 = 6075. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 96 × 65 = 6240. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 731 + 841 = 1572. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 42 × 76 = 3192. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 91 × 32 = 2912. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 22 × 47 = 1039. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 698 + 818 = 1512. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 79 × 84 = 6630. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 309 + 130 = 434. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 612 + 229 = 841. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 82 × 59 = 4838. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 266 + 309 = 575. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 34 = 1258. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 980 + 275 = 1258. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 84 × 98 = 8232. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 771 + 527 = 1293. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 656 + 607 = 1263. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 82 × 69 = 5658. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 422 + 384 = 812. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 623 + 230 = 853. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 26 × 95 = 2468. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 65 × 59 = 3841. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 272 + 317 = 589. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 558 + 833 = 1388. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 39 × 38 = 1482. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 48 × 68 = 3264. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 631 + 290 = 925. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 31 × 12 = 364. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 31 × 77 = 2382. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 99 × 39 = 3864. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 88 × 58 = 5104. Correct or wrong? (a) wrong (b) correct

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