Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 61 · 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: 345 + 612 = 963. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 325 + 276 = 601. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 74 × 63 = 4662. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 33 × 39 = 1287. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 861 + 893 = 1750. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 76 × 93 = 7069. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 228 + 643 = 871. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 879 + 233 = 1111. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 784 + 576 = 1360. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 98 × 27 = 2648. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 212 + 400 = 614. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 318 + 622 = 938. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 38 × 19 = 722. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 354 + 812 = 1166. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 53 × 26 = 1379. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 499 + 363 = 860. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 72 × 95 = 6840. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 74 × 97 = 7178. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 64 × 86 = 5504. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 95 × 54 = 5130. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 36 = 1412. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 53 × 38 = 2018. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 439 + 868 = 1307. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 681 + 998 = 1680. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 15 × 27 = 407. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 374 + 429 = 803. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 28 × 35 = 985. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 26 × 35 = 910. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 87 × 72 = 6264. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 645 + 544 = 1192. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 670 + 254 = 924. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 500 + 383 = 884. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 41 × 33 = 1353. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 77 × 24 = 1848. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 756 + 466 = 1222. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 37 × 65 = 2405. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 82 × 64 = 5240. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 194 + 999 = 1193. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 66 × 55 = 3626. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 573 + 598 = 1170. Correct or wrong? (a) correct (b) wrong

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