Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 647 · 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: 677 + 270 = 940. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 92 × 33 = 3036. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 273 + 556 = 829. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 53 × 80 = 4240. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 46 × 80 = 3683. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 24 × 64 = 1543. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 866 + 585 = 1445. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 50 × 34 = 1700. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 267 + 741 = 1008. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 29 × 71 = 2057. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 380 + 949 = 1325. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 97 × 26 = 2522. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 669 + 163 = 832. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 825 + 161 = 982. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 861 + 880 = 1742. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 51 = 1632. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 90 × 52 = 4680. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 446 + 405 = 855. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 34 × 70 = 2376. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 273 + 405 = 675. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 45 × 59 = 2649. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 950 + 527 = 1483. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 82 = 7055. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 34 × 66 = 2252. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 33 × 35 = 1155. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 34 × 20 = 672. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 28 × 37 = 1033. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 727 + 226 = 958. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 743 + 285 = 1028. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 91 = 3003. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 26 × 32 = 832. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 129 + 381 = 510. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 12 × 22 = 264. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 74 × 76 = 5624. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 190 + 968 = 1153. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 36 × 48 = 1728. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 47 × 20 = 945. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 452 + 554 = 1006. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 43 × 86 = 3698. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 18 × 64 = 1152. Correct or wrong? (a) correct (b) wrong

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