Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 997 · 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: 828 + 183 = 1011. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 73 = 6497. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 74 = 2292. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 94 × 87 = 8178. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 702 + 814 = 1519. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 597 + 320 = 919. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 985 + 964 = 1949. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 362 + 337 = 697. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 37 × 33 = 1225. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 972 + 362 = 1339. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 92 × 65 = 5980. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 19 × 66 = 1254. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 511 + 868 = 1379. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 89 × 86 = 7654. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 20 × 21 = 418. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 55 × 99 = 5445. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 758 + 471 = 1229. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 152 + 223 = 375. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 186 + 335 = 520. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 42 × 50 = 2100. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 32 × 60 = 1918. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 503 + 718 = 1221. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 428 + 524 = 955. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 88 × 89 = 7835. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 365 + 138 = 503. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 89 × 22 = 1958. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 300 + 812 = 1115. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 795 + 171 = 966. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 94 × 30 = 2815. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 72 × 95 = 6840. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 665 + 168 = 838. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 899 + 374 = 1274. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 66 × 99 = 6542. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 193 + 376 = 562. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 162 + 460 = 622. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 324 + 866 = 1190. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 601 + 798 = 1403. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 886 + 160 = 1050. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 54 × 28 = 1512. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 45 × 69 = 3105. Correct or wrong? (a) wrong (b) correct

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