Two simple examples are cooking and carpentry, at least in the US.
For cooking, suppose you needed to double a recipe that called for 3/4 of a cup of sugar. The new recipe would require 2 x 3/4 = 6/4 cups of sugar so you'd have to convert that to a proper fraction.
For carpentry, suppose you had to fasten a brace at the one-quarter, half, and three-quarter points of a wall opening that's 35½ inches wide. To divide 35½ by 4, you could convert the larger number to an improper fraction: 35 is the same as 70 halves, so adding the extra ½ gives you 71/2. Divide by 4 to get 71/8 and convert back to proper form: 71 ÷ 8 = 8-7/8 inches for the distance between the centers of each brace.
Of course if the US finally gives up ounces and inches in favor of metric units used everywhere else, most of these problems would be waaay simpler: The original recipe would need 175 gm of sugar so doubling would be 350 gm. The wall opening would be 900 mm so one-fourth would be 225 mm.
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You use fractions for LOTS of things in the real world like money, gambling, shopping, clothing, etc.
in cookbooks and recipes
because it is easier, faster, and correct.
You use fractions (or some variation, such as decimals) in any situation where whole numbers are not sufficient. For example, when you want to measure the object of a length in meters, and a whole number of meters is not precise enough.
OK The Discussion Is About Fractions In Biology.Ok so here is what you do ok you the the improper denominator and multiply it by its numerator.So after that you put it in groups then divide your answer by the number of groups you used and you get your answer.Thats all bye now(: