Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 55 · 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: 363 + 853 = 1217. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 43 × 89 = 3827. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 87 × 51 = 4439. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 14 = 770. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 47 × 75 = 3525. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 84 × 85 = 7140. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 94 × 34 = 3196. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 915 + 312 = 1227. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 13 × 77 = 1007. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 30 × 42 = 1260. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 866 + 803 = 1677. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 45 × 54 = 2435. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 123 + 521 = 644. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 767 + 224 = 991. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 35 × 27 = 945. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 282 + 217 = 499. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 160 + 186 = 346. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 436 + 135 = 571. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 563 + 474 = 1037. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 494 + 339 = 833. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 865 + 260 = 1120. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 360 + 626 = 986. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 14 × 18 = 252. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 132 + 183 = 310. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 41 × 86 = 3528. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 49 × 49 = 2401. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 88 × 21 = 1843. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 85 × 90 = 7650. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 83 × 66 = 5478. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 89 × 85 = 7565. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 73 × 78 = 5694. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 669 + 541 = 1205. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 94 × 45 = 4234. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 25 × 45 = 1117. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 550 + 870 = 1413. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 356 + 913 = 1268. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 739 + 845 = 1591. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 14 × 41 = 579. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 231 + 167 = 398. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 497 + 167 = 664. Correct or wrong? (a) wrong (b) correct

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