In the following four groups, only the common factor 1 is () a, 19 and 57 B, 24 and 14 C, 26 and 91 D, 15 and 32

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1. What is the greatest common factor of 19 and 57?
2. 38 and 57 common factors fast
3. Least common factor of 14 and 35 least common factor of 19 and 8
4. The greatest common factor of 19 and 21
5. The greatest common factor of 91 56
6. (1) Find the greatest common factors 8 and 56 88 and 11 5 and 17 for each group of numbers below Find the least common multiple of 12 and 48 7 and 8 6, 24 and 36 Fill in the appropriate number in () as required It's a multiple of two and a multiple of three 26(　） 7（　）24 4（　）3（　） It's also a multiple of 2.5.3 63（　） 5（　）0　 6（　）7（）
7. Decompose 64.72.115.98.56.39.45.88.91. Into prime factors
8. Common multiple of 20 30 42 56 72 90 Come on, Kuai
9. The least common factor and the greatest common multiple of 40, 56 and 84
10. What is the common multiple of 6.12.20.30.42.56.72
11. Factor of 210.24.36, common factor of 24 and 36
12. Factor of 12, factor of 18, common factor of 12 and 18, multiple of 4, multiple of 6, common factor of 4 and 6? (within 100)
13. What are the common factors of 14 and 35
14. The common factor of 28 21 14
15. Common factor of 14 and 49 1. A total of 32 dragon boat teams participated in this year's Dragon Boat Race, and finally 6 teams entered the finals. What percentage of all teams entered the finals? 2. Who is bigger, four fifths minus two fifths or nine tenths minus seven tenths? 3. Divide the 4 meter long rope into 11 sections, two of which are () meters long A. 8 out of 11 b, 2 out of 11 C, 4 out of 11 C 4. 5 / 8 + 0.375 =?
16. If the most common factor of A. B is 14, how many common factors of a and B?
17. The common factor of 21 and 49
18. The greatest common factor of 10 and 14
19. What is the greatest common factor of 10 and 11 What about 12 and 18? What about 15 and 25? What about 51 and 3? What about 3 and 7? What about 4 and 10?
20. The greatest common factor of 10 and 35 is () A. 1B. 5C. 10D. 35