Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 873 · 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: 303 + 884 = 1179. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 29 × 65 = 1880. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 18 × 92 = 1655. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 189 + 811 = 1000. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 990 + 130 = 1115. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 89 × 73 = 6498. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 28 × 53 = 1492. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 130 + 955 = 1085. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 168 + 432 = 600. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 73 × 70 = 5118. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 74 × 65 = 4813. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 228 + 134 = 362. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 99 = 2270. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 73 × 85 = 6208. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 22 × 17 = 374. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 248 + 779 = 1021. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 24 = 432. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 269 + 658 = 930. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 538 + 771 = 1302. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 74 × 21 = 1554. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 60 × 37 = 2220. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 348 + 149 = 497. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 991 + 256 = 1247. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 32 = 2624. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 337 + 938 = 1275. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 57 × 44 = 2508. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 805 + 620 = 1423. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 79 × 45 = 3556. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 309 + 124 = 432. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 72 × 23 = 1659. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 201 + 816 = 1011. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 583 + 960 = 1543. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 332 + 397 = 726. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 42 × 62 = 2604. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 17 × 61 = 1033. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 741 + 624 = 1365. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 78 × 70 = 5458. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 979 + 126 = 1099. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 30 × 48 = 1440. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 647 + 274 = 915. Correct or wrong? (a) wrong (b) correct

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