Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 824 · 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: 69 × 64 = 4409. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 14 × 87 = 1215. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 86 = 7568. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 19 × 91 = 1729. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 69 = 1723. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 788 + 375 = 1162. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 859 + 559 = 1418. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 43 = 732. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 62 × 86 = 5325. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 417 + 753 = 1176. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 41 × 25 = 1025. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 27 = 1971. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 424 + 348 = 778. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 61 × 75 = 4575. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 38 × 56 = 2130. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 58 × 33 = 1915. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 20 × 79 = 1580. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 16 × 89 = 1424. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 25 × 33 = 825. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 134 + 867 = 996. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 687 + 465 = 1152. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 46 × 81 = 3726. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 21 × 13 = 281. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 71 × 34 = 2414. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 255 + 803 = 1058. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 43 × 30 = 1290. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 99 × 85 = 8415. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 19 = 381. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 695 + 483 = 1175. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 788 + 837 = 1620. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 80 × 52 = 4160. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 97 × 63 = 6105. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 955 + 831 = 1786. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 748 + 496 = 1244. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 56 × 61 = 3416. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 75 = 972. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 18 × 73 = 1306. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 972 + 581 = 1556. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 63 × 80 = 5039. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 25 × 68 = 1700. Correct or wrong? (a) wrong (b) correct

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