Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 486 · 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: 32 × 29 = 928. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 87 × 82 = 7134. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 37 × 77 = 2849. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 947 + 988 = 1940. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 597 + 573 = 1170. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 588 + 878 = 1467. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 21 × 25 = 525. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 82 × 61 = 5002. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 453 + 325 = 778. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 80 = 2320. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 430 + 224 = 654. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 89 × 27 = 2410. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 38 × 17 = 647. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 771 + 181 = 952. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 24 × 24 = 576. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 61 × 50 = 3050. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 547 + 895 = 1440. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 156 + 755 = 911. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 931 + 489 = 1419. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 976 + 505 = 1481. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 92 × 22 = 2019. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 296 + 280 = 577. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 66 × 31 = 2045. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 54 × 22 = 1192. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 489 + 665 = 1156. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 389 + 212 = 605. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 23 × 23 = 534. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 938 + 624 = 1562. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 66 × 51 = 3366. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 761 + 206 = 972. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 88 × 55 = 4844. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 651 + 515 = 1166. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 15 × 31 = 469. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 58 × 53 = 3074. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 221 + 675 = 896. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 43 × 15 = 645. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 48 × 39 = 1866. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 20 × 92 = 1840. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 966 + 238 = 1212. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 83 × 12 = 996. Correct or wrong? (a) wrong (b) correct

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