Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 800 · 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: 96 × 31 = 2976. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 35 × 69 = 2408. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 43 × 19 = 817. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 79 × 59 = 4661. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 236 + 202 = 438. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 26 × 84 = 2186. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 92 × 85 = 7820. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 55 × 86 = 4735. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 177 + 722 = 904. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 859 + 263 = 1127. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 638 + 268 = 906. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 839 + 507 = 1346. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 225 + 463 = 684. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 13 × 93 = 1217. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 869 + 962 = 1831. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 256 + 235 = 491. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 12 × 66 = 792. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 622 + 747 = 1369. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 92 × 86 = 7912. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 632 + 175 = 807. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 915 + 910 = 1831. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 126 + 690 = 816. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 27 × 15 = 407. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 662 + 181 = 843. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 975 + 415 = 1390. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 715 + 917 = 1632. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 857 + 190 = 1047. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 41 × 17 = 697. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 15 × 62 = 933. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 833 + 936 = 1769. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 300 + 769 = 1075. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 77 × 53 = 4076. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 304 + 604 = 915. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 95 × 24 = 2280. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 40 × 58 = 2320. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 967 + 275 = 1242. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 993 + 411 = 1404. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 692 + 244 = 936. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 723 + 340 = 1062. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 212 + 319 = 531. Correct or wrong? (a) wrong (b) correct

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