Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 136 · 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: 179 + 145 = 324. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 636 + 448 = 1087. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 124 + 259 = 383. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 436 + 926 = 1360. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 82 × 39 = 3198. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 870 + 372 = 1234. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 449 + 334 = 783. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 518 + 314 = 832. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 60 × 14 = 836. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 82 × 21 = 1724. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 372 + 368 = 737. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 229 + 866 = 1098. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 756 + 269 = 1018. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 198 + 258 = 456. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 218 + 637 = 853. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 648 + 585 = 1241. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 328 + 743 = 1071. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 89 × 18 = 1604. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 75 × 44 = 3302. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 228 + 217 = 451. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 49 × 60 = 2940. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 314 + 131 = 446. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 26 × 38 = 996. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 57 × 80 = 4560. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 31 × 12 = 372. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 553 + 812 = 1365. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 354 + 855 = 1214. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 26 × 49 = 1274. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 96 × 66 = 6336. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 68 × 87 = 5916. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 644 + 174 = 818. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 628 + 809 = 1445. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 386 + 216 = 595. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 95 × 62 = 5898. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 881 + 943 = 1822. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 334 + 328 = 662. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 486 + 218 = 704. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 575 + 868 = 1443. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 795 + 600 = 1395. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 64 × 19 = 1216. Correct or wrong? (a) correct (b) wrong

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