Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 581 · 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: 165 + 455 = 616. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 864 + 747 = 1619. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 25 × 30 = 750. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 359 + 675 = 1033. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 739 + 214 = 953. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 515 + 277 = 792. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 121 + 974 = 1095. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 99 × 18 = 1782. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 576 + 789 = 1365. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 685 + 548 = 1233. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 403 + 221 = 624. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 618 + 305 = 923. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 26 × 45 = 1170. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 751 + 674 = 1420. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 29 × 59 = 1711. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 41 × 72 = 2957. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 52 × 23 = 1196. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 715 + 654 = 1371. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 206 + 374 = 586. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 27 × 78 = 2109. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 218 + 980 = 1205. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 79 × 13 = 1020. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 243 + 905 = 1148. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 336 + 362 = 699. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 432 + 174 = 606. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 347 + 749 = 1096. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 79 × 56 = 4424. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 60 × 51 = 3063. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 86 × 55 = 4730. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 71 × 36 = 2556. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 444 + 888 = 1336. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 85 × 35 = 2975. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 704 + 136 = 839. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 253 + 426 = 679. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 721 + 423 = 1144. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 405 + 514 = 919. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 232 + 229 = 458. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 801 + 826 = 1625. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 645 + 682 = 1327. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 778 + 293 = 1064. Correct or wrong? (a) wrong (b) correct

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