# Thread: Help with coverting from percent to whole number please

1. ## Help with coverting from percent to whole number please

Hey guys i need quick man help, please

Calculate the following
a, what is 30% of 45
b,what is 20% of 80

please help me.. i forgot how to do over the holidays.

2. Originally Posted by frankpham12 Hey guys i need quick man help, please

Calculate the following
a, what is 30% of 45
b,what is 20% of 80

please help me.. i forgot how to do over the holidays.
some vocabulary:

"percent" means "out of 100", or "over 100"

"is" means "equals"

"of" in math usually means "multiply"

so to answer part (a) for instance, we would say:

"30% of 45 is ..." which translates to "$\displaystyle \frac {30}{100} \times 45 = \cdots$"

so now you can find that. what do you get for the answer? can you do the second one?

3. Originally Posted by frankpham12 Hey guys i need quick man help, please

Calculate the following
a, what is 30% of 45
b,what is 20% of 80

please help me.. i forgot how to do over the holidays.
(30/100) x 45

(20/100) x 80

You will probably need a calculator to do the arithmetic.

4. Originally Posted by mr fantastic (30/100) x 45

(20/100) x 80

You will probably need a calculator to do the arithmetic.
thanks a lot

5. Originally Posted by frankpham12 Hey guys i need quick man help, please

Calculate the following
a, what is 30% of 45
b,what is 20% of 80

please help me.. i forgot how to do over the holidays.
a) $\displaystyle = 0.3 \times 45 = 3 \times 4.5 = 9 + 4.5 = 13.5$

b) Since 20% = 0.2 x100
20% is a fifth of full value.

Thus

$\displaystyle 80/5 = 16$

6. Originally Posted by RossBrons a) $\displaystyle = 0.3 \times 45 = 3 \times 4.5 = 9 + 4.5 = 13.5$

b) Since 20% = 0.2 x100
20% is a fifth of full value.

Thus

$\displaystyle 80/5 = 16$
thanks for ur help but the others already explained ty

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