The greatest common factor of 75 and 60 is 15.

The maximum side length of a square is15cm.

(75 ÷15) × (60 ÷15) = 5× 4 = 20 pieces

Can be cut into 20 pieces

Question 2: A number is a factor of 600-5=595.

A number is also a factor of 8 18- 13=805.

A number is still a factor of 87 1+4=875.

The greatest common factor of 595,805,875 is 35.

The maximum number of a number is 35.

Question 3: The distance between the midpoint of Village A and Village B is 450÷2=225 meters; The midpoint of village b and village c comes from village b and village C.

630 ÷ 2 = 3 15m

The greatest common factor of 225 and 3 15 is 45.

The maximum distance between two trees is 45 meters.