Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 449 · 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: 537 + 641 = 1186. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 155 + 189 = 344. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 443 + 824 = 1260. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 88 × 34 = 2992. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 83 × 40 = 3328. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 93 × 24 = 2232. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 738 + 978 = 1709. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 75 × 36 = 2700. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 71 × 67 = 4757. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 932 + 780 = 1706. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 25 × 73 = 1818. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 32 × 91 = 2912. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 910 + 282 = 1192. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 86 × 69 = 5926. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 40 × 74 = 2960. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 51 = 1275. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 652 + 505 = 1157. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 268 + 287 = 556. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 76 × 30 = 2280. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 152 + 612 = 764. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 30 × 22 = 659. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 212 + 231 = 450. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 60 × 24 = 1441. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 70 × 12 = 848. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 14 × 58 = 812. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 33 × 45 = 1485. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 13 × 95 = 1240. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 185 + 678 = 865. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 149 + 289 = 438. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 76 × 70 = 5320. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 24 × 89 = 2136. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 591 + 396 = 979. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 62 × 84 = 5208. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 48 × 39 = 1872. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 641 + 393 = 1038. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 81 × 39 = 3159. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 709 + 860 = 1569. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 66 × 17 = 1122. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 21 × 27 = 565. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 939 + 991 = 1935. Correct or wrong? (a) wrong (b) correct

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