Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 362 · 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: 390 + 950 = 1333. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 660 + 434 = 1094. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 94 × 66 = 6204. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 869 + 755 = 1624. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 21 × 77 = 1624. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 479 + 686 = 1165. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 58 × 58 = 3357. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 83 × 38 = 3152. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 183 + 909 = 1100. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 877 + 607 = 1476. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 125 + 877 = 996. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 28 × 81 = 2268. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 301 + 409 = 710. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 25 = 1275. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 213 + 816 = 1029. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 688 + 642 = 1330. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 22 × 83 = 1820. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 308 + 215 = 523. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 928 + 184 = 1112. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 406 + 865 = 1271. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 62 × 61 = 3782. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 991 + 989 = 1985. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 31 × 78 = 2418. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 264 + 797 = 1061. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 805 + 581 = 1384. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 61 × 17 = 1037. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 63 × 45 = 2827. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 333 + 205 = 538. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 505 + 835 = 1340. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 23 × 14 = 317. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 433 + 141 = 574. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 643 + 961 = 1605. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 72 = 4687. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 226 + 143 = 369. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 24 × 76 = 1824. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 17 × 40 = 680. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 492 + 417 = 901. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 791 + 745 = 1536. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 741 + 869 = 1610. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 87 × 81 = 7047. Correct or wrong? (a) wrong (b) correct

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