Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 57 · 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: 423 + 121 = 544. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 59 × 73 = 4307. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 71 = 2201. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 720 + 663 = 1382. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 854 + 828 = 1683. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 439 + 945 = 1384. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 761 + 879 = 1640. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 732 + 673 = 1405. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 568 + 648 = 1216. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 79 × 82 = 6480. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 722 + 228 = 956. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 366 + 687 = 1053. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 24 × 34 = 816. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 75 × 46 = 3450. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 66 × 19 = 1260. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 29 × 84 = 2433. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 993 + 406 = 1401. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 15 × 47 = 705. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 181 + 426 = 607. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 460 + 481 = 941. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 53 × 59 = 3127. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 430 + 400 = 830. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 99 × 80 = 7920. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 26 × 90 = 2340. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 135 + 594 = 729. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 325 + 587 = 911. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 90 × 82 = 7378. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 90 × 29 = 2610. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 243 + 229 = 471. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 158 + 234 = 397. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 46 × 97 = 4456. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 86 × 42 = 3607. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 636 + 630 = 1273. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 834 + 556 = 1397. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 15 × 62 = 930. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 18 × 83 = 1494. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 30 = 2010. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 893 + 775 = 1668. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 28 × 20 = 560. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 28 × 42 = 1173. Correct or wrong? (a) correct (b) wrong

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