Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 53 · 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: 35 × 13 = 460. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 301 + 341 = 644. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 86 × 48 = 4128. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 53 × 37 = 1961. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 58 × 98 = 5684. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 634 + 127 = 761. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 39 = 2658. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 94 × 38 = 3572. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 53 = 1061. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 91 = 2639. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 69 × 23 = 1587. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 372 + 378 = 746. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 94 × 68 = 6392. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 706 + 182 = 888. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 951 + 793 = 1744. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 687 + 899 = 1586. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 451 + 762 = 1207. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 99 × 65 = 6441. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 865 + 279 = 1150. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 92 × 44 = 4051. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 19 × 48 = 912. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 40 × 23 = 920. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 62 × 79 = 4898. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 557 + 820 = 1377. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 262 + 859 = 1121. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 87 × 18 = 1566. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 364 + 796 = 1162. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 155 + 597 = 752. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 128 + 143 = 271. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 98 × 13 = 1274. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 50 × 23 = 1150. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 356 + 667 = 1023. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 67 × 92 = 6166. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 22 × 26 = 568. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 76 × 32 = 2432. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 82 × 56 = 4598. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 87 × 41 = 3564. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 587 + 508 = 1095. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 124 + 405 = 529. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 78 × 62 = 4836. Correct or wrong? (a) correct (b) wrong

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