Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 222 · 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: 61 × 87 = 5306. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 66 × 90 = 5943. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 280 + 539 = 826. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 57 × 35 = 1993. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 71 × 95 = 6742. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 78 × 75 = 5842. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 964 + 785 = 1757. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 486 + 206 = 692. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 979 + 633 = 1612. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 82 = 3690. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 861 + 164 = 1027. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 988 + 202 = 1193. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 18 × 28 = 504. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 664 + 790 = 1446. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 53 × 58 = 3067. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 65 × 37 = 2405. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 136 + 881 = 1013. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 72 × 14 = 1008. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 58 × 33 = 1914. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 66 × 73 = 4818. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 75 × 81 = 6075. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 80 = 1673. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 36 = 1759. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 225 + 581 = 806. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 70 × 97 = 6790. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 991 + 922 = 1918. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 250 + 747 = 997. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 48 = 965. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 35 × 71 = 2492. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 75 × 54 = 4043. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 33 × 97 = 3209. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 545 + 890 = 1443. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 87 × 81 = 7047. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 19 = 588. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 682 + 568 = 1258. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 414 + 261 = 677. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 33 × 29 = 961. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 19 × 38 = 722. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 679 + 800 = 1482. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 19 × 83 = 1577. Correct or wrong? (a) wrong (b) correct

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