Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 952 · 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: 924 + 701 = 1625. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 36 × 48 = 1728. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 36 × 17 = 612. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 185 + 223 = 408. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 38 × 34 = 1292. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 914 + 230 = 1144. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 44 = 4261. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 70 × 57 = 3984. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 86 × 79 = 6794. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 43 × 79 = 3389. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 334 + 411 = 751. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 97 × 68 = 6603. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 43 × 97 = 4171. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 142 + 312 = 456. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 32 × 50 = 1602. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 929 + 640 = 1569. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 78 × 16 = 1245. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 45 × 82 = 3688. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 82 × 54 = 4434. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 353 + 681 = 1034. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 177 + 686 = 863. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 759 + 570 = 1333. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 237 + 132 = 369. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 759 + 170 = 935. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 156 + 696 = 851. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 79 × 77 = 6091. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 86 × 74 = 6369. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 712 + 164 = 876. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 32 × 64 = 2044. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 34 × 37 = 1262. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 290 + 239 = 531. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 54 × 28 = 1514. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 91 × 90 = 8191. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 53 × 74 = 3925. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 364 + 333 = 697. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 171 + 197 = 376. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 32 × 30 = 960. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 36 × 18 = 648. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 47 × 86 = 4049. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 788 + 328 = 1116. Correct or wrong? (a) wrong (b) correct

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