Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 964 · 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 × 66 = 1980. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 72 × 18 = 1295. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 199 + 852 = 1047. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 91 × 13 = 1175. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 946 + 462 = 1400. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 22 × 19 = 416. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 709 + 138 = 847. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 61 × 33 = 2012. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 68 × 89 = 6051. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 46 × 37 = 1697. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 854 + 819 = 1670. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 221 + 895 = 1108. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 40 × 68 = 2719. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 79 × 25 = 1975. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 35 × 99 = 3473. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 361 + 166 = 533. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 647 + 286 = 928. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 85 × 21 = 1785. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 51 × 28 = 1429. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 996 + 302 = 1298. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 895 + 673 = 1568. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 706 + 961 = 1674. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 75 × 97 = 7267. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 89 = 7921. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 906 + 883 = 1792. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 50 × 96 = 4800. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 45 × 84 = 3777. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 728 + 665 = 1393. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 55 × 78 = 4290. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 666 + 238 = 897. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 96 × 27 = 2598. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 844 + 588 = 1427. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 473 + 146 = 619. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 780 + 587 = 1365. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 420 + 927 = 1347. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 37 × 65 = 2411. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 64 × 17 = 1088. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 80 × 63 = 5040. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 802 + 191 = 987. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 589 + 797 = 1380. Correct or wrong? (a) wrong (b) correct

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