Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 775 · 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: 72 × 51 = 3669. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 32 × 68 = 2178. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 578 + 653 = 1231. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 63 × 30 = 1891. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 696 + 625 = 1320. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 324 + 148 = 472. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 835 + 623 = 1458. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 99 × 28 = 2772. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 44 = 528. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 823 + 589 = 1408. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 65 = 1697. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 22 × 94 = 2061. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 739 + 484 = 1218. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 385 + 990 = 1375. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 191 + 585 = 772. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 24 × 35 = 844. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 45 × 56 = 2517. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 55 = 773. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 227 + 441 = 668. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 18 × 55 = 994. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 23 × 73 = 1679. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 53 × 56 = 2974. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 649 + 151 = 805. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 87 × 36 = 3127. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 92 × 34 = 3121. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 57 × 82 = 4674. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 58 × 25 = 1457. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 53 × 51 = 2696. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 41 × 95 = 3902. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 27 × 88 = 2376. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 33 × 49 = 1618. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 235 + 344 = 579. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 26 × 56 = 1463. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 530 + 357 = 886. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 13 × 28 = 362. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 348 + 683 = 1036. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 401 + 382 = 783. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 886 + 659 = 1545. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 884 + 293 = 1183. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 548 + 684 = 1232. Correct or wrong? (a) wrong (b) correct

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