Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 757 · 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: 920 + 524 = 1444. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 822 + 203 = 1025. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 379 + 190 = 572. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 35 × 42 = 1474. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 62 × 16 = 992. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 76 × 43 = 3268. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 736 + 976 = 1708. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 934 + 785 = 1712. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 136 + 488 = 625. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 13 × 52 = 678. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 20 = 676. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 627 + 785 = 1410. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 54 × 74 = 3996. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 19 × 49 = 931. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 29 × 26 = 752. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 178 + 486 = 664. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 85 × 32 = 2720. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 327 + 704 = 1032. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 638 + 555 = 1193. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 19 × 80 = 1513. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 969 + 617 = 1594. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 34 × 25 = 842. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 51 × 17 = 873. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 73 × 92 = 6716. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 634 + 964 = 1590. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 21 × 39 = 820. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 502 + 643 = 1153. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 358 + 653 = 1018. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 82 × 62 = 5080. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 20 × 58 = 1156. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 28 × 57 = 1596. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 514 + 144 = 658. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 35 × 25 = 876. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 972 + 195 = 1164. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 317 + 715 = 1032. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 46 × 98 = 4508. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 215 + 438 = 653. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 897 + 914 = 1810. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 14 × 84 = 1176. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 62 × 85 = 5270. Correct or wrong? (a) wrong (b) correct

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