Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 231 · 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: 659 + 480 = 1139. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 47 × 96 = 4512. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 286 + 238 = 524. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 902 + 520 = 1422. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 441 + 857 = 1298. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 40 × 25 = 999. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 30 × 96 = 2875. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 72 × 14 = 1008. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 31 × 56 = 1736. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 785 + 519 = 1304. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 872 + 189 = 1061. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 60 = 4625. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 460 + 970 = 1430. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 264 + 620 = 884. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 56 × 42 = 2356. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 75 = 2478. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 92 × 32 = 2944. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 26 × 91 = 2366. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 53 × 62 = 3281. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 15 × 89 = 1335. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 144 + 797 = 941. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 30 × 94 = 2820. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 956 + 954 = 1905. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 663 + 501 = 1164. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 374 + 374 = 748. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 54 × 76 = 4105. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 31 = 837. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 454 + 442 = 896. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 669 + 926 = 1603. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 26 × 29 = 754. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 549 + 823 = 1365. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 139 + 123 = 262. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 39 × 50 = 1950. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 187 + 653 = 840. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 363 + 300 = 663. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 49 × 88 = 4312. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 67 × 19 = 1281. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 64 × 50 = 3194. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 310 + 604 = 914. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 241 + 262 = 499. Correct or wrong? (a) correct (b) wrong

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