in a full set of permanent teeth, 1/4 are incisors, 1/4 are premolars, and 3/8 are molars. What fraction of all the teeth are incisors, premolars and molars?

Step-by-step explanation:

The incisors, premolars and molars are equivalent to 7/8 of the wholeset of permanent teeth.

Step-by-step explanation:

To find the whole set of fraction, we need to add all the given fraction given which is part of the full set of permanent teeth.

The full set of permanent teeth will be our whole or such that when you add  all the parts of the teeth given in fraction form, the result will be 1.

In the question, the given are as follows:

1/4 incisors

1/4 premolars

3/8 molars

lets first determine the least common multiple of the denominators 4, 4 and 8. It can be easily observed that the LCM is 8. That way our Least common denominator would be 8.

We need to reduce the above given fractions by first dividing the denominator of the fraction to the LCD then multiplying the quotient to the numerator.

See below:

+  +    =  =

Therefore the incisors, premolars and molars are equivalent to 7/8 of the whole set of permanent teeth.

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