Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 247 · 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: 62 × 24 = 1488. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 337 + 234 = 569. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 351 + 252 = 603. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 845 + 800 = 1645. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 272 + 334 = 606. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 426 + 393 = 819. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 752 + 539 = 1290. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 43 × 79 = 3401. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 789 + 816 = 1613. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 248 + 185 = 439. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 83 × 40 = 3320. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 13 × 37 = 478. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 519 + 456 = 975. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 923 + 834 = 1757. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 93 × 64 = 5952. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 912 + 651 = 1561. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 306 + 946 = 1252. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 379 + 392 = 771. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 267 + 236 = 506. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 303 + 889 = 1190. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 41 × 95 = 3896. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 40 × 46 = 1839. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 30 × 68 = 2040. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 262 + 325 = 587. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 36 × 23 = 828. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 53 × 54 = 2870. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 22 × 16 = 351. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 82 × 51 = 4187. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 48 × 25 = 1198. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 814 + 220 = 1040. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 491 + 942 = 1433. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 893 + 260 = 1153. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 928 + 476 = 1404. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 606 + 203 = 808. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 24 × 78 = 1878. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 605 + 387 = 992. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 166 + 156 = 322. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 39 × 93 = 3627. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 929 + 199 = 1129. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 46 × 89 = 4087. Correct or wrong? (a) wrong (b) correct

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