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Students Mentoring Students Presents: Learning Decimals and percent!. Ruben Sanchez jsanc488@cp.epcc.edu. BEFORE WE START:. We are here to help you! Do NOT be afraid to ask questions. There are no dumb questions! The only dumb thing to do is not ask for help when you are stuck. .4.

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students mentoring students presents learning decimals and percent

Students Mentoring StudentsPresents:Learning Decimals and percent!

Ruben Sanchez

jsanc488@cp.epcc.edu

before we start

BEFORE WE START:

  • We are here to help you! Do NOT be afraid to ask questions.
  • There are no dumb questions!
  • The only dumb thing to do is not ask for help when you are stuck.
decimals

.4

.3333333333333333333333

.25

.8

.875

Decimals.

.2

.125

Decimals can be easily understood as “parts” of a number. Decimals always start with a period,or a point, and then a number follows.

.10

slide4

Decimals.

There is a very simple way to find a decimal number. The simplest

way to do so is just to divide the fraction that you are given.

What you do here to get a decimal is divide the numbers shown.

On a calculator plug in

And your answer should be

slide5

Decimals converting to percentages

Lets use the previous example of

To get a percentage out of this number, it is very simple.

and multiply it by 100.

All we do is multiply

When we do this we get a total of

slide6

Decimals converting to percentages

Lets use an example of

We can simplify this fraction to

Or we can just divide the first numbers trough to get

In this case when we multiply by 100 we get

We’ll just round off the repeating infinite decimal to 2 decimal places

slide7

Decimals converting to percentages

One easy trick to remember how to change decimals to percentages

is to just move over the decimal to the right 2 places after you divide

the numerator by the denominator.

We move the decimal to the right  2 places and we get 80.

All we do afterward is add the percent sign.

Move the decimal point 2 places to the right to get

slide8

Decimals converting to percentages

Convert the following fractions to decimals then to percentages

slide9

Decimals converting to percentages

If Mary was driving to San Diego from El Paso, and she only had 1/2(half) a tank of

fuel, how much fuel does Mary have? Express your answer in decimal and in

percent form.

1)

What if Mary had 7/8(seven eighths) of her tank full?

How much would that be in percent and in decimal?

1a)