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The unit that is used in the denominator is the one to cancels the unit that appears in a numerator.
The denominator must contain the unit that you wish to cancel in the numerator of the other number.
They are a common factor and any common factor in the numerator and denominator of a ratio can be cancelled out.
cross product method is multiplying the numerator of the first factor to the denominator of the second factor and multiplying the denominator to the numerator of the second factor.
Find the Greatest Common Factor of the numerator and denominator, then divide the numerator by the GCF, and that is the new numerator. Divide the denominator by the GCF, and that is the new denominator.