Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 434 · 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: 779 + 184 = 963. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 778 + 416 = 1194. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 30 × 94 = 2822. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 41 × 41 = 1674. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 996 + 257 = 1253. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 597 + 445 = 1042. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 27 × 28 = 755. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 327 + 475 = 802. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 55 × 49 = 2698. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 834 + 523 = 1358. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 913 + 573 = 1486. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 966 + 923 = 1887. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 86 × 33 = 2831. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 958 + 230 = 1184. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 19 = 306. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 405 + 192 = 597. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 312 + 564 = 873. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 16 × 36 = 576. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 27 × 35 = 945. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 766 + 979 = 1753. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 381 + 809 = 1187. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 62 × 24 = 1489. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 793 + 489 = 1278. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 69 × 52 = 3591. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 48 × 16 = 775. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 989 + 827 = 1813. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 65 × 89 = 5785. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 358 + 693 = 1051. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 51 × 23 = 1168. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 89 × 85 = 7567. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 15 × 94 = 1415. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 75 × 83 = 6222. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 473 + 164 = 630. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 554 + 172 = 726. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 98 × 19 = 1862. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 75 × 72 = 5400. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 40 × 17 = 680. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 201 + 213 = 414. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 33 × 37 = 1215. Correct or wrong? (a) correct (b) wrong

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