Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 40 · 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: 643 + 877 = 1520. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 216 + 874 = 1090. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 42 × 58 = 2443. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 62 × 30 = 1860. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 474 + 865 = 1339. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 52 × 87 = 4532. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 494 + 130 = 630. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 308 + 418 = 723. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 392 + 991 = 1383. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 26 × 71 = 1848. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 25 × 69 = 1726. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 650 + 792 = 1442. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 503 + 231 = 728. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 41 × 26 = 1066. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 19 = 1634. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 67 × 79 = 5298. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 642 + 420 = 1062. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 158 + 445 = 603. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 39 × 66 = 2575. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 52 × 45 = 2340. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 23 × 60 = 1380. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 630 + 276 = 906. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 847 + 385 = 1232. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 739 + 334 = 1073. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 71 × 35 = 2485. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 70 × 20 = 1405. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 347 + 884 = 1231. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 436 + 206 = 640. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 675 + 764 = 1439. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 85 × 58 = 4923. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 457 + 760 = 1212. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 51 × 69 = 3513. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 764 + 195 = 959. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 557 + 523 = 1080. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 89 × 49 = 4365. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 51 × 52 = 2656. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 77 × 41 = 3157. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 897 + 193 = 1098. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 19 × 41 = 779. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 68 × 48 = 3262. Correct or wrong? (a) correct (b) wrong

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