Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 866 · 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: 43 × 97 = 4172. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 68 × 81 = 5505. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 88 = 7478. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 144 + 214 = 358. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 57 × 16 = 906. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 122 + 268 = 390. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 527 + 767 = 1294. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 628 + 656 = 1284. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 233 + 139 = 373. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 485 + 355 = 843. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 397 + 278 = 675. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 77 = 1155. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 38 × 37 = 1412. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 70 × 99 = 6930. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 979 + 912 = 1892. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 78 × 42 = 3276. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 97 × 43 = 4164. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 97 × 66 = 6402. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 54 × 55 = 2962. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 473 + 258 = 734. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 590 + 811 = 1402. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 793 + 710 = 1503. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 75 × 45 = 3370. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 13 × 92 = 1196. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 58 × 51 = 2957. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 655 + 784 = 1440. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 329 + 153 = 482. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 784 + 699 = 1483. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 924 + 488 = 1412. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 99 × 32 = 3175. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 547 + 310 = 856. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 466 + 134 = 600. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 25 × 99 = 2475. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 207 + 570 = 777. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 636 + 194 = 831. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 32 = 2083. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 806 + 963 = 1769. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 898 + 167 = 1065. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 245 + 307 = 552. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 218 + 847 = 1058. Correct or wrong? (a) correct (b) wrong

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