Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 288 · 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: 81 × 49 = 3971. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 204 + 274 = 478. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 32 = 3072. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 421 + 200 = 621. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 483 + 510 = 993. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 56 × 45 = 2518. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 85 × 12 = 1027. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 77 = 2702. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 510 + 135 = 645. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 161 + 146 = 305. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 18 × 18 = 324. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 33 × 15 = 502. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 82 × 31 = 2542. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 44 × 14 = 624. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 210 + 959 = 1169. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 723 + 324 = 1051. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 995 + 888 = 1889. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 844 + 264 = 1108. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 438 + 139 = 577. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 267 + 326 = 593. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 96 = 2016. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 46 × 33 = 1513. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 986 + 175 = 1161. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 270 + 373 = 646. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 586 + 314 = 900. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 669 + 283 = 952. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 90 × 60 = 5401. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 935 + 480 = 1415. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 22 × 34 = 748. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 92 × 71 = 6530. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 505 + 216 = 721. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 23 × 34 = 782. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 25 × 36 = 907. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 683 + 880 = 1563. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 35 × 31 = 1085. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 130 + 933 = 1055. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 799 + 890 = 1695. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 624 + 470 = 1094. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 54 × 91 = 4914. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 286 + 799 = 1081. Correct or wrong? (a) correct (b) wrong

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