Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 547 · 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: 48 × 31 = 1488. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 46 × 84 = 3867. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 98 × 33 = 3242. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 17 × 64 = 1095. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 73 × 39 = 2847. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 211 + 750 = 966. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 738 + 676 = 1408. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 95 × 73 = 6927. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 197 + 935 = 1134. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 816 + 882 = 1698. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 449 + 889 = 1332. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 869 + 290 = 1161. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 586 + 545 = 1130. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 975 + 256 = 1229. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 841 + 819 = 1665. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 209 + 736 = 945. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 54 × 61 = 3294. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 79 × 27 = 2136. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 22 × 37 = 814. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 12 × 66 = 792. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 389 + 228 = 613. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 544 + 803 = 1350. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 791 + 804 = 1592. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 295 + 146 = 441. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 524 + 192 = 717. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 489 + 366 = 856. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 288 + 211 = 499. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 809 + 227 = 1036. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 13 × 18 = 238. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 181 + 684 = 865. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 183 + 649 = 832. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 593 + 234 = 823. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 16 × 48 = 773. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 76 × 77 = 5852. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 72 × 45 = 3246. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 799 + 624 = 1423. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 66 × 34 = 2240. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 76 × 16 = 1216. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 194 + 245 = 439. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 62 × 14 = 874. Correct or wrong? (a) correct (b) wrong

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