PSAT Math : How to divide fractions

Example Questions

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Example Question #1 : How To Divide Fractions

Simplify:

a/b/c/d

It is already in simplest terms

a2/c2

ac/bd

Explanation:

Division is the same as multiplying by the reciprocal.  Thus, a/b ÷ c/d = a/b x d/c = ad/bc

Example Question #101 : Fractions

If p is a positive integer, and 4 is the remainder when p-8 is divided by 5, which of the following could be the value of p?

20

18

17

19

17

Explanation:

Remember that if x has a remainder of 4 when divided by 5, x minus 4 must be divisible by 5. We are therefore looking for a number p such that p - 8 - 4 is divisible by 5. The only answer choice that fits this description is 17.

Example Question #1 : How To Divide Fractions

If  and , then what is the value of ?

Explanation:

Dividing by a number (in this case ) is equivalent to multiplying by its reciprocal (in this case ).  Therefore:

Example Question #4 : How To Divide Fractions

Evaluate the following:

Explanation:

First we will evaluate the terms in the parentheses:

Next, we will square the first fraction:

We can evaluate the division as such:

Example Question #2 : How To Divide Fractions

Simplify:

Explanation:

Start by rewriting this fraction as a division problem:

When dividing fractions, you multiply by the reciprocal of the second fraction, so you can rewrite your problem like this:

Multiply across the numerators and then across the denominators to get . The x's cancel, and you can reduce the fraction to be .

Example Question #1 : How To Divide Fractions

Define an operation  as follows:

For all real numbers ,

.

Evaluate .

Explanation:

, or, equivalently,

Example Question #7 : How To Divide Fractions

Define an operation  as follows:

For all real numbers ,

.

Evaluate .

Explanation:

,

or, equivalently,

Example Question #8 : How To Divide Fractions

Define an operation  as follows:

For all real numbers ,

.

Evaluate .

Explanation:

Example Question #1 : How To Divide Fractions

Define an operation  as follows:

For all real numbers ,

.

Evaluate .

Explanation:

Example Question #2 : How To Divide Fractions

Define an operation  as follows:

For all real numbers ,

.

Evaluate .