The denominators need to be the same for subtraction. Find the Least Common Denominator for both items and then subtract.
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Because to add fractions, the denominators must be equal.
unlike fractions
unlike fractions
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.
What is the definition of Adding and Subtracting Like Fractions