Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 314 · 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: 988 + 213 = 1208. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 44 × 73 = 3211. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 86 × 19 = 1627. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 31 × 95 = 2952. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 82 × 90 = 7380. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 65 × 17 = 1101. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 20 × 78 = 1560. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 565 + 438 = 996. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 550 + 580 = 1130. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 363 + 868 = 1231. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 350 + 738 = 1088. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 31 × 76 = 2356. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 87 × 78 = 6794. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 313 + 307 = 620. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 13 × 82 = 1065. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 417 + 772 = 1189. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 428 + 395 = 824. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 53 × 77 = 4081. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 13 × 13 = 169. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 27 × 32 = 864. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 50 × 51 = 2553. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 535 + 508 = 1043. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 18 × 86 = 1548. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 611 + 851 = 1462. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 613 + 391 = 999. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 377 + 140 = 518. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 565 + 524 = 1089. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 31 × 17 = 527. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 62 × 49 = 3038. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 754 + 390 = 1140. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 64 × 19 = 1219. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 16 × 77 = 1232. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 642 + 344 = 978. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 971 + 490 = 1461. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 213 + 602 = 815. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 72 × 78 = 5616. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 808 + 435 = 1243. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 34 × 69 = 2346. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 87 × 62 = 5394. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 51 × 23 = 1175. Correct or wrong? (a) wrong (b) correct

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