Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 944 · 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: 480 + 604 = 1084. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 208 + 233 = 441. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 92 × 80 = 7355. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 41 × 57 = 2337. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 947 + 757 = 1709. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 451 + 507 = 958. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 437 + 616 = 1052. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 12 × 75 = 900. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 494 + 803 = 1297. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 418 + 333 = 752. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 505 + 654 = 1163. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 935 + 649 = 1584. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 37 × 16 = 592. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 34 × 74 = 2516. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 42 × 79 = 3318. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 70 × 35 = 2458. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 50 × 40 = 2008. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 291 + 305 = 596. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 726 + 978 = 1704. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 59 × 29 = 1711. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 599 + 243 = 842. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 23 × 56 = 1289. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 82 × 23 = 1887. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 22 = 836. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 648 + 847 = 1495. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 877 + 424 = 1299. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 369 + 233 = 602. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 19 × 52 = 988. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 962 + 544 = 1502. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 950 + 435 = 1385. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 81 × 71 = 5751. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 63 = 4792. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 749 + 278 = 1027. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 20 × 60 = 1194. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 224 + 308 = 529. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 56 × 99 = 5551. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 82 × 22 = 1804. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 201 + 141 = 341. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 273 + 503 = 778. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 577 + 739 = 1318. Correct or wrong? (a) wrong (b) correct

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