Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 10 · 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: 29 × 69 = 2001. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 51 × 14 = 721. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 61 × 61 = 3723. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 67 × 22 = 1472. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 355 + 816 = 1170. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 16 × 22 = 352. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 38 × 44 = 1676. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 896 + 516 = 1405. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 31 × 89 = 2759. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 44 × 29 = 1276. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 321 + 500 = 821. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 602 + 883 = 1485. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 71 × 91 = 6464. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 45 × 42 = 1894. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 569 + 221 = 790. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 952 + 432 = 1384. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 20 × 77 = 1540. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 67 × 53 = 3551. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 70 × 46 = 3220. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 38 × 95 = 3602. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 907 + 841 = 1751. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 853 + 393 = 1246. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 15 = 735. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 311 + 479 = 790. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 52 × 81 = 4217. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 95 × 48 = 4560. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 288 + 186 = 474. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 45 × 89 = 4003. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 76 × 38 = 2884. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 418 + 614 = 1025. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 289 + 422 = 711. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 46 × 65 = 2990. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 211 + 218 = 429. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 65 × 23 = 1495. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 550 + 162 = 712. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 88 × 80 = 7040. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 437 + 334 = 769. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 966 + 289 = 1262. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 86 × 16 = 1374. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 996 + 902 = 1898. Correct or wrong? (a) wrong (b) correct

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