Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 348 · 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: 185 + 950 = 1136. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 59 × 68 = 4018. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 69 × 16 = 1104. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 858 + 858 = 1716. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 206 + 160 = 364. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 773 + 746 = 1519. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 75 × 51 = 3829. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 467 + 184 = 656. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 786 + 318 = 1104. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 83 × 65 = 5395. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 783 + 165 = 948. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 668 + 472 = 1140. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 87 × 64 = 5568. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 533 + 318 = 851. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 457 + 230 = 680. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 17 × 14 = 238. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 280 + 558 = 838. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 39 × 39 = 1523. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 89 × 82 = 7298. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 27 × 92 = 2484. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 37 × 85 = 3145. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 18 × 12 = 216. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 74 × 40 = 2968. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 819 + 551 = 1373. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 561 + 472 = 1041. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 82 × 18 = 1476. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 551 + 304 = 855. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 32 × 96 = 3075. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 31 × 90 = 2790. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 63 × 15 = 945. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 524 + 675 = 1199. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 532 + 541 = 1073. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 169 + 748 = 917. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 76 = 1299. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 78 × 12 = 936. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 317 + 296 = 606. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 62 × 81 = 5022. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 89 × 82 = 7298. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 377 + 434 = 804. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 656 + 833 = 1489. Correct or wrong? (a) wrong (b) correct

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