Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 257 · 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: 67 × 30 = 2010. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 23 × 23 = 529. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 311 + 233 = 544. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 359 + 207 = 566. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 433 + 435 = 868. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 30 × 87 = 2610. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 677 + 301 = 978. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 48 × 26 = 1248. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 95 × 38 = 3609. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 14 × 70 = 986. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 63 × 23 = 1445. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 45 × 19 = 855. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 226 + 411 = 637. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 82 × 12 = 981. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 971 + 368 = 1332. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 54 = 864. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 897 + 149 = 1049. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 678 + 436 = 1109. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 65 × 93 = 6045. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 70 × 13 = 910. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 20 = 255. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 86 × 46 = 3956. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 79 × 82 = 6478. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 25 × 51 = 1279. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 78 × 58 = 4523. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 374 + 687 = 1065. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 21 × 91 = 1917. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 41 × 18 = 738. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 924 + 809 = 1735. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 77 × 30 = 2312. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 60 × 39 = 2340. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 179 + 798 = 977. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 469 + 804 = 1269. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 356 + 666 = 1020. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 49 = 4661. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 47 × 57 = 2679. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 13 × 54 = 707. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 133 + 844 = 973. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 508 + 475 = 989. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 46 × 17 = 782. Correct or wrong? (a) wrong (b) correct

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