Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 35 · 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: 25 × 32 = 800. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 297 + 175 = 474. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 253 + 315 = 568. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 733 + 867 = 1600. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 34 = 2720. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 40 × 64 = 2560. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 47 × 29 = 1358. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 83 × 65 = 5395. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 339 + 234 = 575. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 86 × 71 = 6098. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 681 + 834 = 1515. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 55 × 43 = 2357. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 662 + 523 = 1185. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 25 × 89 = 2224. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 83 × 35 = 2905. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 505 + 381 = 886. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 615 + 837 = 1452. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 30 × 19 = 573. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 69 × 29 = 2003. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 27 = 864. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 473 + 940 = 1407. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 527 + 185 = 712. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 665 + 273 = 940. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 68 × 70 = 4758. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 576 + 776 = 1352. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 254 + 356 = 610. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 764 + 611 = 1375. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 958 + 123 = 1081. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 35 × 61 = 2137. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 99 × 81 = 8022. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 622 + 844 = 1466. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 78 = 936. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 461 + 299 = 757. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 37 × 36 = 1336. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 158 + 982 = 1140. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 93 × 38 = 3537. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 204 + 699 = 903. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 586 + 768 = 1361. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 817 + 926 = 1743. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 42 × 31 = 1302. Correct or wrong? (a) correct (b) wrong

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