Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 180 · 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: 415 + 648 = 1063. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 27 × 22 = 589. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 84 × 40 = 3360. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 46 × 90 = 4138. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 38 × 58 = 2202. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 314 + 656 = 970. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 84 = 4704. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 991 + 611 = 1609. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 984 + 848 = 1832. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 252 + 499 = 751. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 127 + 467 = 590. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 205 + 527 = 739. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 15 × 31 = 466. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 57 × 18 = 1028. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 82 × 78 = 6394. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 998 + 508 = 1503. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 85 × 49 = 4173. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 62 × 24 = 1489. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 41 × 82 = 3360. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 28 = 901. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 991 + 608 = 1606. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 45 × 14 = 630. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 353 + 292 = 645. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 830 + 866 = 1697. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 412 + 833 = 1243. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 62 × 28 = 1738. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 337 + 837 = 1180. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 910 + 168 = 1078. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 576 + 859 = 1434. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 147 + 253 = 400. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 316 + 138 = 454. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 511 + 860 = 1371. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 64 × 93 = 5958. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 888 + 237 = 1125. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 757 + 282 = 1031. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 974 + 925 = 1899. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 484 + 599 = 1083. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 221 + 657 = 878. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 265 + 882 = 1153. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 66 × 22 = 1445. Correct or wrong? (a) wrong (b) correct

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