Math is related to fractions.
if you look in a math book or just online then one of the math topics is fractions. You learn how to divide, multiply, add and subtract, simplify and more about fractions and what to do with them.
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In school, Mary thinks math is the worst subject because of fractions.
They are related because you can comvert decimals into fractions,and fractions into decimals.
They can show the same number, just in different ways. You can convert fractions into decimals or decimals into fractions.
That depends what operation you need to do: you have to learn separately how to add and subtract, multiply, divide, simplify, and expand fractions. Since this is a rather long topic, I suggest you review your school books, or check some online resources. See the related links for one of them.
When a fraction is simplified, it is made into an equivalent fraction with no common divisor between the numerator and denominator.