Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 870 · 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: 91 × 33 = 3003. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 589 + 190 = 779. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 35 × 88 = 3080. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 530 + 356 = 889. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 653 + 433 = 1086. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 26 × 92 = 2392. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 759 + 602 = 1357. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 803 + 836 = 1639. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 639 + 131 = 764. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 210 + 401 = 607. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 675 + 961 = 1637. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 570 + 663 = 1227. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 153 + 413 = 569. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 80 × 19 = 1520. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 639 + 417 = 1050. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 35 × 52 = 1828. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 965 + 420 = 1390. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 75 × 67 = 5025. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 63 × 46 = 2891. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 920 + 668 = 1594. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 66 = 2244. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 422 + 323 = 745. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 14 × 54 = 748. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 76 × 97 = 7375. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 143 + 217 = 354. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 840 + 255 = 1095. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 704 + 216 = 922. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 667 + 832 = 1499. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 63 × 25 = 1582. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 22 × 61 = 1342. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 359 + 499 = 862. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 486 + 884 = 1367. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 334 + 756 = 1083. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 282 + 647 = 923. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 577 + 498 = 1075. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 36 × 96 = 3462. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 358 + 128 = 489. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 97 × 90 = 8730. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 55 × 87 = 4785. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 894 + 482 = 1370. Correct or wrong? (a) wrong (b) correct

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