Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 576 · 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: 237 + 597 = 827. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 31 × 15 = 465. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 613 + 122 = 727. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 345 + 697 = 1036. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 46 × 79 = 3634. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 530 + 659 = 1187. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 64 × 36 = 2304. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 908 + 428 = 1340. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 74 × 55 = 4064. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 84 = 3858. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 25 = 824. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 190 + 205 = 395. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 68 × 46 = 3128. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 262 + 990 = 1252. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 20 = 1220. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 35 × 14 = 491. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 76 × 79 = 5998. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 24 × 97 = 2328. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 81 × 65 = 5268. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 75 × 32 = 2403. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 882 + 791 = 1673. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 862 + 794 = 1656. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 98 × 68 = 6664. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 51 × 13 = 665. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 21 × 56 = 1176. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 37 × 57 = 2109. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 141 + 272 = 419. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 213 + 224 = 434. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 58 × 27 = 1566. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 58 = 1914. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 37 × 43 = 1591. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 25 × 82 = 2056. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 18 × 78 = 1404. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 353 + 377 = 730. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 96 = 1922. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 345 + 256 = 601. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 337 + 968 = 1305. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 620 + 772 = 1388. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 922 + 151 = 1074. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 390 + 150 = 540. Correct or wrong? (a) wrong (b) correct

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