Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 124 · 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: 714 + 528 = 1242. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 89 × 92 = 8190. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 85 = 1360. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 579 + 906 = 1485. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 91 × 36 = 3280. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 89 × 56 = 4976. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 73 = 2186. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 694 + 741 = 1435. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 81 × 86 = 6971. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 43 × 13 = 563. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 199 + 598 = 797. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 543 + 832 = 1376. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 68 × 74 = 5036. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 322 + 954 = 1276. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 316 + 898 = 1214. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 365 + 149 = 514. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 282 + 723 = 1010. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 673 + 986 = 1658. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 873 + 955 = 1828. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 307 + 947 = 1254. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 84 × 29 = 2428. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 998 + 890 = 1888. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 74 = 4663. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 77 = 6307. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 89 × 86 = 7654. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 38 × 21 = 798. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 17 × 48 = 811. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 95 × 76 = 7224. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 575 + 602 = 1171. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 25 × 13 = 330. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 246 + 491 = 737. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 85 × 69 = 5866. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 15 × 97 = 1455. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 76 = 6916. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 766 + 964 = 1735. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 926 + 418 = 1344. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 861 + 715 = 1570. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 53 × 89 = 4723. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 86 × 50 = 4305. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 801 + 357 = 1150. Correct or wrong? (a) correct (b) wrong

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