Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 985 · 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: 290 + 749 = 1039. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 621 + 779 = 1392. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 79 × 59 = 4655. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 285 + 253 = 538. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 773 + 871 = 1644. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 369 + 747 = 1116. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 96 × 24 = 2311. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 83 × 51 = 4233. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 80 × 76 = 6080. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 31 × 49 = 1514. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 667 + 531 = 1198. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 752 + 609 = 1361. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 710 + 895 = 1605. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 92 × 40 = 3673. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 57 = 3477. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 358 + 987 = 1345. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 22 × 14 = 308. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 843 + 154 = 997. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 368 + 848 = 1216. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 381 + 140 = 517. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 824 + 124 = 940. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 852 + 586 = 1446. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 68 × 48 = 3262. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 23 × 14 = 314. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 91 × 50 = 4551. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 86 × 35 = 3010. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 58 × 66 = 3828. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 21 = 1409. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 62 × 98 = 6082. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 15 × 36 = 548. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 538 + 302 = 840. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 780 + 791 = 1571. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 65 × 51 = 3315. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 835 + 190 = 1025. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 214 + 741 = 952. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 705 + 744 = 1453. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 499 + 308 = 807. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 16 × 97 = 1553. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 81 × 55 = 4450. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 96 × 21 = 2016. Correct or wrong? (a) correct (b) wrong

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