Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 120 · 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: 554 + 293 = 847. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 41 = 2665. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 753 + 582 = 1335. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 763 + 244 = 1007. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 883 + 239 = 1128. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 759 + 966 = 1725. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 92 × 33 = 3036. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 696 + 378 = 1074. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 94 × 56 = 5264. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 132 + 263 = 395. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 12 × 51 = 605. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 34 × 17 = 578. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 269 + 991 = 1259. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 68 × 96 = 6530. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 493 + 136 = 629. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 77 × 17 = 1308. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 15 × 19 = 285. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 438 + 768 = 1206. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 85 × 13 = 1108. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 849 + 841 = 1690. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 37 × 24 = 888. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 20 × 43 = 852. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 397 + 802 = 1200. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 552 + 743 = 1303. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 556 + 222 = 778. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 885 + 471 = 1356. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 40 × 21 = 840. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 76 × 60 = 4560. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 39 × 76 = 2964. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 50 × 78 = 3900. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 337 + 597 = 939. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 495 + 120 = 616. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 382 + 447 = 829. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 83 × 97 = 8051. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 698 + 488 = 1186. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 749 + 803 = 1556. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 61 × 34 = 2074. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 89 × 25 = 2232. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 529 + 530 = 1051. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 449 + 807 = 1256. Correct or wrong? (a) correct (b) wrong

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