Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 139 · 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: 78 × 75 = 5857. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 272 + 236 = 508. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 29 × 55 = 1595. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 548 + 935 = 1483. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 27 = 2216. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 304 + 125 = 429. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 754 + 426 = 1180. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 58 × 89 = 5162. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 867 + 344 = 1218. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 29 × 38 = 1102. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 38 × 47 = 1786. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 88 × 23 = 2024. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 29 × 73 = 2114. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 84 × 28 = 2352. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 84 × 19 = 1596. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 544 + 759 = 1309. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 12 × 20 = 240. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 748 + 260 = 1008. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 66 × 86 = 5680. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 720 + 303 = 1023. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 37 × 21 = 777. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 81 × 97 = 7857. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 791 + 351 = 1137. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 269 + 531 = 799. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 18 × 97 = 1746. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 24 × 56 = 1346. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 59 × 86 = 5074. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 395 + 196 = 595. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 58 × 96 = 5568. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 124 + 166 = 290. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 676 + 450 = 1130. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 976 + 809 = 1785. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 20 × 30 = 604. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 334 + 377 = 711. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 20 × 57 = 1145. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 33 × 33 = 1089. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 177 + 363 = 540. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 76 × 75 = 5706. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 214 + 446 = 660. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 71 × 31 = 2201. Correct or wrong? (a) wrong (b) correct

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