Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 316 · 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: 985 + 150 = 1138. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 79 = 7186. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 319 + 868 = 1187. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 907 + 407 = 1322. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 379 + 709 = 1088. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 761 + 991 = 1752. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 718 + 930 = 1645. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 63 × 88 = 5545. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 96 × 30 = 2880. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 591 + 410 = 1001. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 315 + 506 = 823. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 422 + 526 = 948. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 65 × 90 = 5854. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 650 + 814 = 1468. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 99 × 46 = 4554. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 64 × 57 = 3648. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 247 + 184 = 439. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 423 + 491 = 914. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 904 + 749 = 1653. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 314 + 564 = 870. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 276 + 800 = 1079. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 444 + 998 = 1437. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 706 + 247 = 953. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 44 × 83 = 3652. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 85 × 93 = 7905. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 76 × 45 = 3420. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 77 × 98 = 7546. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 449 + 847 = 1296. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 469 + 219 = 688. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 817 + 764 = 1581. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 62 × 55 = 3418. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 417 + 813 = 1230. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 51 × 76 = 3876. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 61 = 1037. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 869 + 721 = 1590. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 920 + 826 = 1746. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 67 × 12 = 804. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 60 = 3240. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 19 × 57 = 1090. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 28 × 24 = 672. Correct or wrong? (a) correct (b) wrong

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