Algebra 1 assist » Percents » Fractions and also Percentage » just how to discover percentage indigenous a portion

If Jessica obtained 2 out of 20 concerns wrong ~ above her many recent mathematics quiz, what percent walk she obtain correct?

Explanation:

Since she obtained 2 the end of 20 incorrect, we can an initial figure out the percent incorrect. We deserve to either uncover the decimal for 2/20, or make 2/20 a portion with 100 in the denominator. In this case, it is easier to do the latter. We must multiply 20 by 5 to acquire 100, thus we main point 2 by 5 to acquire 10. Then, we have that 2/20 is equivalent to 10/100. She shed 10 percent ~ above her math quiz, leave her through a score the 90%.

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10/100 = 10% wrong

(100%) – (10% wrong) = 90% right

Which the the complying with represents the portion

as a percentage?

Explanation:

We need to collection up a relationship to transform our portion to x/100.

Cross multiply.

(1)(100) = (8)(x)

100 = 8x

Divide both political parties by 8.

(100)/8 = (8x)/8

100/8 = x

Simplify.

100/8 = 25/2 = 12.5

Our price is 12.5%.

A die was rolling

times and landed top top the number "
"
times. What percent of the time was the result a number other 보다
?

Explanation:

Here, the most essential step is to understand what the concern is asking.

A "

" to be rolled
of a total of
times, but the question is asking around numbers other than
.

A number various other than

was rolled
times that the full
.

Now, the last step is to convert

into a percent. Due to the fact that
is a multiple of
, the is a fast conversion.
is equal to
and the prize is
.

A very big bag is filled v marbles.

of the bag is filled v red marbles. Another
the the bag is filled through blue marbles. The remainder of the bag is filled v yellow marbles. What portion of the bag is filled v yellow marbles?

Explanation:

First, friend must find what fraction of the bag is filled with yellow marbles. We recognize that

the the bag filled through red marbles and
of the bag is filled v blue marbles. So, the fraction of the bag filled through yellow marbles should equal to

or

Next, you transform

come a percentage, i m sorry is 25%.

Jamie ate

of a pizza for lunch and
that the exact same pizza later for dinner. What percent of the pizza is left uneaten?

Explanation:

Jamie ate

the a pizza because that lunch and also
of the exact same pizza for dinner. To convert a fraction to a percentage, girlfriend simply transform the fraction so the the denominator is 100. So, Jamie ate
of the pizza for lunch and
that the pizza because that dinner. Due to the fact that the denominator of this fractions is 100, the molecule is its percent equivalent. Thus, Jamie ate 25% of the pizza because that lunch and 20% for dinner for a total of 45% the the pizza. 55% the the pizza stays uneaten.

Billy empties his pockets and finds some change. He find 2 quarters, 4 dimes, 5 nickels and also 9 pennies. What portion of the coins are nickels?

Explanation:

First, we can discover out the ratio of coins that are nickels. So, we know there are 5 nickels and also we deserve to count there space 20 coins total

So over there are

coins that room nickels. However the question asks because that the percentage. To find the percentage, we have the right to just discover our answer as a decimal value rather than a fraction. 보다 multiply by 100%. So,

A student took a test and also got 13 the end of 20 concerns correct. What portion of inquiries did this student get correct?

Explanation:

We have the right to mathematically write "13 out of 20" together a fraction.

We can convert this to a percent by setup up a proportion.

Cross multiply and solve because that

.

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So, the student acquired

that the concerns correct.

Explanation:

To find the percent, first, collection up the fraction as a long division problem whereby the 1 is put inside the dividend and 8 is inserted in the divisor: