Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 191 · 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: 164 + 905 = 1069. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 240 + 584 = 824. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 17 × 36 = 616. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 857 + 269 = 1126. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 298 + 419 = 715. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 18 × 30 = 540. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 59 × 13 = 767. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 85 × 36 = 3061. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 72 = 1864. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 829 + 542 = 1368. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 616 + 234 = 850. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 59 = 2124. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 455 + 520 = 983. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 853 + 343 = 1194. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 23 × 32 = 736. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 30 × 67 = 2012. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 517 + 249 = 762. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 381 + 320 = 701. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 52 × 38 = 1976. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 73 = 1314. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 286 + 776 = 1065. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 942 + 979 = 1921. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 326 + 670 = 996. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 31 × 81 = 2509. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 46 × 91 = 4184. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 97 × 57 = 5536. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 88 × 51 = 4491. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 390 + 943 = 1339. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 59 × 57 = 3371. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 733 + 974 = 1706. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 34 × 62 = 2116. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 51 × 61 = 3111. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 30 × 14 = 421. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 582 + 720 = 1299. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 256 + 525 = 781. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 20 × 93 = 1868. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 552 + 340 = 892. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 349 + 908 = 1257. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 193 + 469 = 662. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 472 + 140 = 615. Correct or wrong? (a) correct (b) wrong

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