Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 335 · 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: 72 × 29 = 2094. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 31 × 58 = 1795. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 197 + 204 = 399. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 583 + 237 = 820. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 19 × 60 = 1140. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 57 × 30 = 1715. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 83 × 30 = 2490. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 477 + 282 = 753. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 49 × 45 = 2201. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 254 + 760 = 1014. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 30 × 73 = 2191. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 631 + 233 = 860. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 456 + 662 = 1118. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 35 × 23 = 805. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 130 + 194 = 324. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 64 = 3833. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 31 × 29 = 905. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 279 + 232 = 511. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 814 + 330 = 1136. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 909 + 955 = 1864. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 618 + 313 = 931. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 13 × 41 = 533. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 83 × 18 = 1496. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 189 + 616 = 805. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 42 = 630. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 66 × 33 = 2186. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 472 + 427 = 902. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 78 × 64 = 4991. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 838 + 418 = 1256. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 969 + 321 = 1283. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 91 × 60 = 5460. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 84 = 3108. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 14 × 60 = 840. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 87 × 45 = 3915. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 519 + 287 = 806. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 624 + 974 = 1592. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 72 × 44 = 3173. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 576 + 480 = 1060. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 54 × 76 = 4098. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 275 + 161 = 436. Correct or wrong? (a) correct (b) wrong

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