You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.
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When you want to add or subtract unlike fractions.
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.
Make the fractions equivalent then subtract
no, to add and subtract like and unlike fractions the denominator has to be the same,
In fractions, you can NEVER add or subtract