Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 685 · 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: 222 + 852 = 1074. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 388 + 404 = 792. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 65 × 50 = 3250. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 53 × 43 = 2287. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 236 + 684 = 920. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 588 + 998 = 1587. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 24 × 47 = 1134. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 873 + 371 = 1241. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 133 + 143 = 272. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 511 + 242 = 757. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 652 + 945 = 1597. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 240 + 414 = 654. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 584 + 404 = 988. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 34 × 21 = 714. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 90 × 23 = 2077. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 37 × 99 = 3663. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 62 × 48 = 2979. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 663 + 122 = 778. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 42 × 31 = 1302. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 343 + 484 = 827. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 88 × 89 = 7832. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 279 + 713 = 992. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 77 × 50 = 3850. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 954 + 344 = 1298. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 74 × 68 = 5040. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 176 + 824 = 993. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 585 + 415 = 1000. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 556 + 135 = 691. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 26 = 489. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 23 × 53 = 1219. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 92 × 87 = 8002. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 562 + 580 = 1142. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 359 + 490 = 849. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 53 × 41 = 2166. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 927 + 687 = 1614. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 62 × 92 = 5706. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 21 × 35 = 735. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 74 × 69 = 5106. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 211 + 426 = 637. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 23 × 12 = 281. Correct or wrong? (a) correct (b) wrong

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