They're only used half as much
Their presentation. A vulgar fraction can have a variety of bases like 1/4, 1/2, 3/8 etc., so it's not always east to compare. Decimals are always in tenths, so much more simple.
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All terminating decimals can be written as fractions.
Whole numbers are positive numbers and there are no fractions or decimals.
Decimals are fractions. Fractions are easy to picture graphically. Considering them in a concrete fashion makes the basic operations of addition and subtraction easy to visualize.
2/10.
50 in decimals is simply 50.00 or in fractions, it is fifty over one.