Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 227 · 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: 910 + 355 = 1262. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 98 × 32 = 3128. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 29 × 16 = 464. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 94 × 48 = 4512. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 645 + 692 = 1337. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 99 × 28 = 2770. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 93 × 98 = 9114. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 77 × 48 = 3692. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 404 + 655 = 1051. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 921 + 333 = 1260. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 705 + 335 = 1038. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 333 + 833 = 1163. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 68 × 43 = 2924. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 726 + 274 = 1000. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 29 × 70 = 2030. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 17 = 401. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 28 × 89 = 2492. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 979 + 875 = 1860. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 495 + 126 = 629. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 551 + 880 = 1431. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 15 × 80 = 1201. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 547 + 771 = 1318. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 22 × 76 = 1672. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 60 × 46 = 2760. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 141 + 299 = 440. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 632 + 502 = 1133. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 94 = 8178. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 306 + 750 = 1057. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 519 + 889 = 1404. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 70 × 46 = 3226. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 14 × 33 = 461. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 42 = 546. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 53 × 15 = 795. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 969 + 206 = 1173. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 835 + 947 = 1782. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 506 + 918 = 1425. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 376 + 867 = 1237. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 994 + 638 = 1633. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 994 + 441 = 1435. Correct or wrong? (a) correct (b) wrong

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