Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 167 · 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: 681 + 574 = 1255. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 691 + 176 = 867. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 70 × 95 = 6650. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 211 + 320 = 531. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 45 × 69 = 3103. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 257 + 696 = 953. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 45 × 15 = 671. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 76 × 92 = 6985. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 23 × 99 = 2279. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 708 + 944 = 1652. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 162 + 499 = 663. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 925 + 908 = 1833. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 60 × 18 = 1073. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 216 + 977 = 1196. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 251 + 673 = 930. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 411 + 998 = 1409. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 986 + 991 = 1977. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 18 × 19 = 342. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 247 + 863 = 1112. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 50 × 26 = 1300. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 571 + 908 = 1479. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 73 × 46 = 3362. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 584 + 482 = 1066. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 32 × 70 = 2240. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 39 × 26 = 1014. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 877 + 210 = 1088. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 422 + 277 = 691. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 56 × 66 = 3696. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 90 × 85 = 7646. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 144 + 202 = 349. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 499 + 519 = 1026. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 62 × 86 = 5332. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 568 + 147 = 715. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 38 × 30 = 1141. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 52 × 63 = 3276. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 93 = 1209. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 464 + 490 = 962. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 847 + 882 = 1721. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 133 + 880 = 1013. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 758 + 165 = 926. Correct or wrong? (a) wrong (b) correct

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