Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 301 · 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: 28 × 30 = 840. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 481 + 320 = 797. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 776 + 170 = 946. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 374 + 180 = 554. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 45 × 96 = 4326. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 72 × 30 = 2158. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 27 × 86 = 2322. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 421 + 208 = 625. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 69 = 1932. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 497 + 625 = 1122. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 47 × 43 = 2015. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 83 × 13 = 1087. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 754 + 679 = 1429. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 39 × 61 = 2375. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 162 + 653 = 812. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 95 × 35 = 3329. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 97 × 61 = 5917. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 87 × 22 = 1910. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 66 = 6468. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 345 + 494 = 839. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 194 + 940 = 1138. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 52 × 17 = 884. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 24 × 63 = 1511. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 434 + 838 = 1275. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 752 + 231 = 983. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 758 + 394 = 1152. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 20 × 45 = 894. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 61 × 13 = 793. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 687 + 865 = 1552. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 52 × 97 = 5044. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 95 = 5410. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 39 × 40 = 1558. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 937 + 555 = 1488. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 808 + 447 = 1255. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 993 + 905 = 1896. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 186 + 225 = 416. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 79 × 49 = 3864. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 728 + 813 = 1548. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 743 + 462 = 1205. Correct or wrong? (a) wrong (b) correct

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