Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 740 · 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: 500 + 247 = 739. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 877 + 189 = 1069. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 26 × 49 = 1277. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 408 + 646 = 1054. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 12 = 804. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 581 + 906 = 1487. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 42 = 1596. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 455 + 885 = 1337. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 36 × 40 = 1447. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 417 + 192 = 605. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 42 × 78 = 3276. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 22 × 44 = 968. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 39 × 92 = 3586. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 68 × 31 = 2108. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 49 = 4508. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 77 × 26 = 2010. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 88 × 68 = 5984. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 84 × 81 = 6812. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 868 + 406 = 1273. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 974 + 934 = 1908. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 832 + 254 = 1086. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 291 + 831 = 1122. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 43 × 78 = 3362. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 662 + 906 = 1564. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 740 + 415 = 1155. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 23 × 21 = 490. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 277 + 884 = 1161. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 798 + 574 = 1377. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 137 + 899 = 1036. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 20 × 93 = 1860. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 887 + 259 = 1146. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 199 + 199 = 397. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 817 + 562 = 1385. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 12 × 71 = 852. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 72 × 34 = 2448. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 258 + 171 = 429. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 55 × 18 = 988. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 59 × 21 = 1240. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 90 × 60 = 5396. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 40 × 60 = 2404. Correct or wrong? (a) wrong (b) correct

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