Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 312 · 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: 455 + 865 = 1317. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 68 × 35 = 2380. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 65 × 43 = 2795. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 406 + 926 = 1333. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 36 × 12 = 430. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 28 × 21 = 586. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 353 + 625 = 975. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 927 + 710 = 1637. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 60 × 43 = 2581. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 97 = 5335. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 525 + 453 = 981. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 92 × 78 = 7179. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 72 × 30 = 2162. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 993 + 311 = 1301. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 265 + 939 = 1205. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 67 × 60 = 4022. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 866 + 332 = 1198. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 12 × 63 = 761. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 592 + 255 = 847. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 72 × 76 = 5473. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 866 + 270 = 1142. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 711 + 845 = 1556. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 91 × 69 = 6276. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 76 = 1520. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 63 × 70 = 4410. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 39 × 71 = 2761. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 79 × 43 = 3402. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 49 × 20 = 975. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 21 × 53 = 1113. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 490 + 873 = 1363. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 63 × 48 = 3020. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 25 × 73 = 1825. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 19 × 45 = 855. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 25 × 97 = 2427. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 201 + 350 = 553. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 274 + 959 = 1233. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 469 + 755 = 1224. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 98 × 27 = 2652. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 72 × 31 = 2232. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 174 + 666 = 840. Correct or wrong? (a) correct (b) wrong

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