I never heard about "four fundamental fractions". There is a concept of fundamental operations, which refers to addition, subtraction, multiplication and division, but I don't think that "fundamental fractions" has any commonly-accepted meaning in math.
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+,-,*/, are the four fundamental operations
Eight fractions is.
four twentys = eighty. Equivalent fractions are 80/1, 240/3
The four fundamental operations in arithmetic are addition, subtraction, multiplication and division.
They Are both ways to express partial #'s