Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 886 · 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: 30 × 57 = 1710. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 809 + 477 = 1286. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 240 + 764 = 1004. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 204 + 815 = 1014. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 354 + 474 = 836. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 679 + 946 = 1625. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 134 + 505 = 639. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 188 + 442 = 630. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 59 × 42 = 2478. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 135 + 716 = 851. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 14 × 14 = 196. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 54 × 37 = 1998. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 36 × 96 = 3456. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 28 × 92 = 2574. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 57 × 34 = 1938. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 989 + 142 = 1135. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 53 = 1855. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 79 × 57 = 4503. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 350 + 670 = 1026. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 443 + 368 = 811. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 25 × 22 = 556. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 46 × 25 = 1157. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 244 + 999 = 1242. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 680 + 285 = 965. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 57 × 49 = 2801. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 655 + 881 = 1530. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 95 × 73 = 6935. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 68 × 34 = 2312. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 80 × 62 = 4965. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 81 × 57 = 4609. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 66 × 13 = 858. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 50 × 31 = 1550. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 356 + 680 = 1036. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 37 × 61 = 2254. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 74 × 90 = 6657. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 473 + 689 = 1169. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 75 × 14 = 1050. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 194 + 337 = 531. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 18 × 26 = 476. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 27 × 49 = 1323. Correct or wrong? (a) correct (b) wrong

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