Find the greatest common factors 32 and 72, 75 and 25, 80 and 125, 40 and 60, 17 and 51, 14 and 54 of each group And what did you find

32 and 72 are 8, 75 and 25, 80 and 125 are 5, 40 and 60 are 20, 17 and 51 are 17
14 and 54 are 2
It is found that if two numbers are multiple relations, the small number is their greatest common factor

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1. 32 and 72, 75 and 25, 80 and 125, 40 and 60, 17 and 51, 14 and 54. What do you find
2. 42, 45, 40, 47 (), (), 36, 51, Don't write what I don't understand, write the formula
3. 36,9,42, (), (), 51, () can only add and subtract. Please explain the solution
4. In the fifth grade, oral arithmetic is practiced every day from 42 to 45, 51 to 54
5. Calculation: 108 ° 18 ′ - 56 ° 23 ′=______ ．
6. How to solve 108 ° 18 ′ + 56 ° 23 ′ 40 ″,
7. The solutions of 108 ° 18 '- 56 ° 23' are expressed in degrees
8. 108°18′+56°23′40〃
9. Among the numbers 3, 15, 22, 51, 78, 60, 83, 210, 29 and 56, odd numbers are: even numbers are: prime numbers are: composite numbers are: multiples of 2 The multiples of 3 are: the numbers with factor 5 are () the numbers with 2, 3 multiples are () the numbers with 3, 5 multiples are () the numbers with 2, 3, 5 multiples are () at the same time（
10. There is a set of data: 42, 44, 44, 46, 48, 48, 48, 50, 51, 51, 56______ The mode is______ ．
11. The least common multiple of 11 and 13 is () times their greatest common factor
12. The greatest common factor and the least common multiple of 11 and 13
13. The greatest common factor and the least common multiple of 11 and 3
14. Simple calculation of primary school 51 * 1 -- 6 / 0.9
15. 4.9 * 6.8 + 0.51 * 6.8
16. 0 1 3 9 ) 51 The answer is 21
17. What are the numbers in brackets? A, 1 B, 10 C, 53 D, 130
18. Please fill in the most likely numbers in brackets: 3,7,21,51103, () Please give the derivation process
19. In order to make 51 () fill in this number, it has both factor 2 and factor 3. What number can () fill in
20. 1 / 3 () 1 / 3 () 1 / 3 = 2 / 9 can be filled with brackets and operation symbols