Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 934 · 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: 92 × 29 = 2670. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 545 + 692 = 1235. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 857 + 154 = 1016. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 814 + 521 = 1335. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 30 = 384. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 762 + 619 = 1381. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 96 × 34 = 3256. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 13 × 92 = 1191. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 86 × 33 = 2836. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 76 = 4484. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 422 + 514 = 936. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 51 × 20 = 1026. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 78 × 54 = 4216. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 566 + 137 = 709. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 795 + 513 = 1308. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 97 × 90 = 8723. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 132 + 227 = 359. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 266 + 610 = 876. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 13 × 76 = 988. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 12 × 64 = 769. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 36 × 47 = 1692. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 95 × 33 = 3135. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 843 + 789 = 1640. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 25 × 30 = 750. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 35 × 91 = 3185. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 29 × 22 = 636. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 919 + 457 = 1376. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 374 + 430 = 804. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 83 × 19 = 1577. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 779 + 341 = 1124. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 460 + 314 = 774. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 214 + 453 = 667. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 43 × 22 = 947. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 432 + 728 = 1162. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 22 × 97 = 2134. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 780 + 173 = 952. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 762 + 673 = 1435. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 879 + 970 = 1849. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 239 + 845 = 1077. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 325 + 663 = 988. Correct or wrong? (a) correct (b) wrong

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