Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 156 · 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: 374 + 385 = 759. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 41 × 17 = 697. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 45 = 4320. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 21 × 36 = 756. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 55 × 71 = 3912. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 22 × 98 = 2161. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 577 + 437 = 1014. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 159 + 363 = 522. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 313 + 568 = 873. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 12 = 336. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 331 + 855 = 1184. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 396 + 320 = 716. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 228 + 250 = 484. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 82 × 43 = 3526. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 91 × 51 = 4640. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 70 × 35 = 2447. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 913 + 405 = 1313. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 204 + 142 = 346. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 18 × 75 = 1351. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 95 × 34 = 3234. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 265 + 572 = 840. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 62 × 27 = 1667. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 96 × 95 = 9120. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 81 × 20 = 1620. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 18 × 88 = 1584. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 82 × 38 = 3116. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 862 + 424 = 1282. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 719 + 465 = 1184. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 555 + 747 = 1302. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 250 + 345 = 595. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 26 × 36 = 936. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 612 + 175 = 787. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 314 + 763 = 1077. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 854 + 866 = 1720. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 55 × 26 = 1430. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 919 + 781 = 1704. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 259 + 926 = 1185. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 76 × 90 = 6840. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 61 × 80 = 4873. Correct or wrong? (a) correct (b) wrong

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