Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 826 · 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: 292 + 929 = 1221. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 302 + 176 = 478. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 78 × 80 = 6240. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 611 + 567 = 1177. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 390 + 269 = 662. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 205 + 723 = 928. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 977 + 540 = 1509. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 39 × 16 = 624. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 573 + 124 = 704. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 223 + 398 = 621. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 644 + 642 = 1291. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 46 × 39 = 1791. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 391 + 773 = 1161. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 21 × 78 = 1638. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 94 × 80 = 7520. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 45 × 68 = 3058. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 24 × 93 = 2231. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 27 × 58 = 1559. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 46 × 82 = 3771. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 34 × 80 = 2720. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 94 = 1222. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 570 + 673 = 1243. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 629 + 918 = 1541. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 522 + 632 = 1161. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 168 + 353 = 513. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 43 × 47 = 2021. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 685 + 183 = 871. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 735 + 764 = 1500. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 20 = 380. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 145 + 145 = 290. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 808 + 529 = 1337. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 809 + 384 = 1193. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 94 × 33 = 3107. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 46 × 79 = 3634. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 175 + 534 = 709. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 61 × 98 = 5978. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 24 × 59 = 1416. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 824 + 271 = 1095. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 63 × 45 = 2843. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 40 × 92 = 3675. Correct or wrong? (a) wrong (b) correct

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