By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.
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You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.
You can always find a common denominator by multiplying the denominators together.
To find a common denominator, it's what 4 and 7 go into, and that's 28.
The is no "largest" common denominator. For any denominator you find, we can multiply it by a natural number and come up with a larger one. Do you mean LEAST COMMON DENOMINATOR?
no