Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.
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Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.
Fractions can be converted to decimals, percentages or mixed numbers.
In fractions, you can NEVER add or subtract
It depends on what you want to convert to proper fractions. Not all things can be converted to proper fractions.
144/10.