Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 255 · 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: 37 × 31 = 1146. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 214 + 860 = 1082. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 858 + 406 = 1264. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 323 + 269 = 592. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 24 × 94 = 2256. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 361 + 191 = 552. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 41 × 60 = 2460. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 853 + 187 = 1045. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 815 + 562 = 1377. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 247 + 335 = 581. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 961 + 938 = 1899. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 96 = 7297. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 78 × 46 = 3587. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 552 + 556 = 1108. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 331 + 679 = 1008. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 877 + 278 = 1156. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 22 = 1628. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 36 × 88 = 3172. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 98 × 90 = 8819. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 493 + 846 = 1336. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 50 × 24 = 1201. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 262 + 757 = 1019. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 717 + 674 = 1391. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 377 + 263 = 643. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 779 + 811 = 1590. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 63 × 74 = 4666. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 123 + 157 = 288. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 848 + 309 = 1157. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 31 × 51 = 1581. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 812 + 907 = 1719. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 35 × 80 = 2802. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 18 × 76 = 1368. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 400 + 786 = 1186. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 97 × 92 = 8924. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 471 + 541 = 1012. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 687 + 573 = 1263. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 121 + 123 = 239. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 315 + 637 = 952. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 68 = 880. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 531 + 920 = 1451. Correct or wrong? (a) wrong (b) correct

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