Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 204 · 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: 33 × 70 = 2310. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 214 + 821 = 1035. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 33 × 73 = 2409. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 326 + 683 = 1009. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 480 + 407 = 887. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 773 + 188 = 967. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 830 + 824 = 1650. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 657 + 577 = 1234. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 246 + 851 = 1097. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 875 + 401 = 1276. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 833 + 310 = 1149. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 235 + 734 = 969. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 95 × 62 = 5890. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 440 + 148 = 588. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 99 × 13 = 1287. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 54 = 5022. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 503 + 831 = 1334. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 35 × 73 = 2549. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 88 × 89 = 7832. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 187 + 962 = 1151. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 770 + 310 = 1080. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 29 × 13 = 382. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 517 + 762 = 1274. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 48 × 12 = 576. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 21 × 42 = 888. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 158 + 891 = 1050. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 94 × 88 = 8272. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 607 + 789 = 1396. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 45 × 76 = 3421. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 59 × 83 = 4901. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 41 × 87 = 3574. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 64 × 77 = 4936. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 474 + 643 = 1117. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 50 × 81 = 4050. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 44 × 72 = 3173. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 836 + 273 = 1107. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 748 + 654 = 1402. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 297 + 654 = 956. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 738 + 470 = 1210. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 90 × 85 = 7653. Correct or wrong? (a) correct (b) wrong

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