Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 454 · 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: 808 + 583 = 1391. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 53 = 794. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 430 + 779 = 1202. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 266 + 122 = 393. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 206 + 700 = 904. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 55 × 69 = 3803. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 565 + 174 = 739. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 96 × 50 = 4807. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 218 + 323 = 541. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 86 × 73 = 6278. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 13 × 80 = 1040. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 72 × 91 = 6551. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 75 × 27 = 2025. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 17 × 31 = 527. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 53 × 58 = 3074. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 30 × 27 = 810. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 622 + 247 = 869. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 24 = 665. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 44 × 29 = 1276. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 378 + 504 = 885. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 18 × 13 = 232. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 796 + 262 = 1058. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 435 + 583 = 1013. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 49 × 92 = 4508. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 199 + 787 = 994. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 99 = 8019. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 26 × 39 = 1014. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 973 + 269 = 1241. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 411 + 564 = 975. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 366 + 292 = 661. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 36 × 89 = 3207. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 71 × 36 = 2556. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 29 × 36 = 1044. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 52 × 74 = 3848. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 80 × 63 = 5040. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 886 + 654 = 1540. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 910 + 140 = 1050. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 422 + 260 = 686. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 777 + 690 = 1469. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 63 × 35 = 2205. Correct or wrong? (a) correct (b) wrong

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