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There are two equivalent ways:

1. Find the highest common factor (HCF) of the numerator (top) and denominator (bottom) of the fraction. If it is 1, the fraction is already in its lowest terms. If not, divided both, numerator and denominator, by the HCF. The fraction is now in its lowest form.

2. Find any common factor of the numerator (top) and denominator (bottom) of the fraction. If the only common factor is 1, the fraction is already in its lowest terms. If not, divided both, numerator and denominator, by the HCF. Repeat the process until the only common factor is 1. The fraction is then in its lowest form.

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12y ago
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Wiki User

7y ago

Find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.

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Q: What is the rule to change to lowest terms?
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