Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 875 · 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: 87 × 79 = 6866. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 617 + 723 = 1340. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 717 + 411 = 1130. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 56 × 93 = 5208. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 140 + 502 = 647. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 326 + 741 = 1067. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 457 + 312 = 769. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 78 × 32 = 2494. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 55 × 19 = 1041. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 314 + 840 = 1154. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 16 × 75 = 1199. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 242 + 639 = 889. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 597 + 218 = 810. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 299 + 638 = 937. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 93 × 88 = 8184. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 87 = 2784. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 92 × 87 = 8002. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 54 × 31 = 1677. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 549 + 904 = 1453. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 146 + 934 = 1086. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 841 + 200 = 1041. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 967 + 368 = 1335. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 12 × 25 = 308. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 432 + 329 = 757. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 220 + 999 = 1219. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 319 + 246 = 570. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 231 + 720 = 951. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 62 × 63 = 3905. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 181 + 974 = 1155. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 77 × 42 = 3234. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 876 + 723 = 1599. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 65 × 17 = 1105. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 358 + 960 = 1318. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 607 + 509 = 1116. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 66 × 63 = 4158. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 576 + 705 = 1286. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 373 + 444 = 817. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 75 × 36 = 2705. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 58 × 32 = 1852. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 804 + 527 = 1331. Correct or wrong? (a) correct (b) wrong

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