Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 258 · 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: 55 × 15 = 824. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 48 × 21 = 1008. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 18 × 16 = 289. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 269 + 129 = 398. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 521 + 284 = 805. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 87 × 55 = 4790. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 47 × 52 = 2437. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 90 × 17 = 1535. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 27 × 88 = 2370. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 575 + 648 = 1223. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 378 + 121 = 499. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 772 + 741 = 1513. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 78 × 22 = 1720. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 995 + 548 = 1546. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 96 × 41 = 3936. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 512 + 340 = 852. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 22 × 83 = 1819. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 75 × 39 = 2925. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 374 + 204 = 578. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 49 × 27 = 1318. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 33 × 92 = 3036. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 58 × 69 = 4002. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 702 + 819 = 1525. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 74 × 96 = 7106. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 90 × 65 = 5856. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 825 + 141 = 966. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 55 × 40 = 2199. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 839 + 275 = 1111. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 528 + 228 = 755. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 338 + 585 = 920. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 811 + 779 = 1584. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 437 + 215 = 655. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 37 × 73 = 2701. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 441 + 996 = 1437. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 843 + 319 = 1156. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 956 + 326 = 1282. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 614 + 724 = 1338. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 792 + 861 = 1653. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 51 × 45 = 2295. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 122 + 788 = 910. Correct or wrong? (a) correct (b) wrong

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