Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 851 · 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: 281 + 820 = 1098. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 533 + 887 = 1425. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 98 × 30 = 2935. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 358 + 331 = 682. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 763 + 882 = 1639. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 40 × 17 = 678. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 80 × 33 = 2640. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 82 × 53 = 4346. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 18 × 72 = 1298. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 12 × 40 = 480. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 50 × 79 = 3950. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 951 + 477 = 1420. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 20 × 15 = 299. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 337 + 958 = 1295. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 57 = 1083. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 15 × 24 = 360. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 88 × 79 = 6952. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 36 × 60 = 2162. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 70 × 22 = 1540. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 968 + 340 = 1311. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 925 + 420 = 1346. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 98 × 24 = 2350. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 610 + 762 = 1372. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 12 × 16 = 191. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 799 + 654 = 1450. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 732 + 591 = 1329. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 74 × 16 = 1180. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 404 + 866 = 1274. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 960 + 424 = 1384. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 706 + 825 = 1531. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 88 = 3607. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 81 × 34 = 2759. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 16 × 77 = 1240. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 12 × 64 = 765. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 91 × 31 = 2821. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 88 = 3432. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 62 = 3284. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 38 = 3564. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 55 × 53 = 2915. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 87 × 25 = 2175. Correct or wrong? (a) correct (b) wrong

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