Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 514 · 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: 525 + 763 = 1280. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 871 + 285 = 1156. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 499 + 739 = 1246. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 667 + 941 = 1603. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 61 × 99 = 6045. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 624 + 645 = 1269. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 21 × 30 = 630. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 95 × 85 = 8076. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 31 × 12 = 372. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 88 × 70 = 6160. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 43 × 21 = 897. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 949 + 271 = 1220. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 70 × 41 = 2867. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 47 × 93 = 4363. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 94 × 35 = 3289. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 49 × 30 = 1470. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 42 × 88 = 3697. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 244 + 265 = 513. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 368 + 273 = 641. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 86 × 19 = 1634. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 291 + 179 = 464. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 55 × 60 = 3301. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 439 + 830 = 1270. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 291 + 532 = 821. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 85 × 61 = 5177. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 971 + 940 = 1913. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 825 + 331 = 1156. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 916 + 696 = 1612. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 54 × 67 = 3618. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 78 = 2964. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 985 + 297 = 1282. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 76 × 48 = 3648. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 992 + 231 = 1219. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 237 + 970 = 1204. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 957 + 824 = 1781. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 30 × 78 = 2340. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 347 + 434 = 782. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 40 × 55 = 2200. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 340 + 159 = 499. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 126 + 211 = 337. Correct or wrong? (a) correct (b) wrong

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