Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 994 · 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: 60 × 23 = 1388. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 63 × 83 = 5228. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 787 + 927 = 1714. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 501 + 895 = 1391. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 816 + 884 = 1703. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 789 + 584 = 1373. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 200 + 685 = 886. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 82 × 27 = 2217. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 57 × 56 = 3198. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 62 = 4030. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 37 × 99 = 3660. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 267 + 344 = 611. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 27 × 19 = 510. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 48 = 816. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 65 × 76 = 4942. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 595 + 899 = 1494. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 627 + 249 = 876. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 243 + 227 = 470. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 57 × 72 = 4106. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 81 × 76 = 6156. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 63 × 75 = 4725. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 920 + 135 = 1057. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 85 × 28 = 2378. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 227 + 770 = 997. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 191 + 324 = 515. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 84 × 78 = 6552. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 70 × 26 = 1826. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 726 + 778 = 1507. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 27 × 57 = 1538. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 147 + 395 = 544. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 220 + 798 = 1015. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 278 + 215 = 493. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 90 × 73 = 6570. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 50 × 70 = 3501. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 341 + 138 = 479. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 51 × 98 = 5001. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 815 + 681 = 1496. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 73 × 47 = 3431. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 979 + 177 = 1156. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 366 + 704 = 1075. Correct or wrong? (a) wrong (b) correct

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