They are the fundamental operations of arithmetic: addition, subtraction, multiplication and division.
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AdditionSubtractionDivisionMultiplication
Divison
When dividing by a fraction we invert the fraction and change the operation to multiply. So 4/5 ÷ 1/2 becomes instead 4/5 x 2/1 which gives 8/5 which simplifies to 13/5 .
22.75
-- As a fraction of a pound . . . . . 1/4 -- Fraction of a cup . . . . . 1/2 -- Fraction of a pint . . . . . 1/4 -- Fraction of a quart . . . . . 1/8 -- Fraction of an ounce . . . . . 4/1 -- Fraction of a gallon . . . . . 1/32