In subtraction you take away rather than add.
Also, addition is commutative, subtraction is not so the order of the numbers does matter for subtraction.
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When adding or subtracting fractions their denominators must be the same
Subtracting a fraction is the same as adding its negative.
Ensure that the denominators are the same when adding or subtracting fractions.
You cannot add or subtract fractions with different denominators. If the denominators are different then you need to work with equivalent fractions.
Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.