Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 644 · 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: 189 + 674 = 863. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 32 × 85 = 2720. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 75 × 24 = 1807. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 930 + 320 = 1255. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 380 + 401 = 781. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 347 + 488 = 839. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 86 × 71 = 6106. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 175 + 940 = 1114. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 877 + 535 = 1406. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 375 + 386 = 761. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 483 + 270 = 753. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 988 + 276 = 1264. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 74 = 1184. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 18 × 26 = 468. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 80 × 18 = 1440. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 519 + 429 = 955. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 36 × 23 = 828. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 362 + 232 = 594. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 421 + 189 = 610. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 513 + 939 = 1456. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 478 + 739 = 1217. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 167 + 876 = 1045. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 16 × 64 = 1031. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 47 × 90 = 4227. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 795 + 133 = 928. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 281 + 226 = 507. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 95 = 3509. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 17 × 30 = 511. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 75 × 82 = 6150. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 86 × 15 = 1290. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 716 + 959 = 1675. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 75 = 3458. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 27 × 18 = 486. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 18 × 82 = 1475. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 906 + 367 = 1270. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 78 × 43 = 3354. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 211 + 585 = 800. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 61 × 74 = 4516. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 179 + 242 = 421. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 45 × 24 = 1074. Correct or wrong? (a) wrong (b) correct

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