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Multiply the numerator and the denominator by the same number or divide the numerator and the denominator by the same number
Only in improper fractions where the numerator is a multiple of the denominator.
You add two fractions with a different denominator by multiplying the denominators by a number that will make them equal. Be sure to multiply the numerator by that number too.
In standard fractions both numerator and denominator must be integers.
by looking at the denominator