Question

How do you do 1.5/2.5 of 15?

Answer 1

"of" means multiply
\[ \frac{1.5}{2.5} \cdot 15 \]
to get rid of the decimals, you can multiply top and bottom by 10
\[ \frac{15}{25} \cdot 15 \]
can you finish?

Answer 2

I would first simplify the fraction by dividing top and bottom by 5
what do you get ?

Answer 3

like what is 1.5/2.5 of 15

Answer 4

re-read my post more carefully.

Answer 5

do you know how to simplify
15/25
by dividing the top number by 5 and the bottom number by 5?

Answer 6

you get 3/5

Answer 7

yes, that means the problem is
\[ \frac{3}{5} \cdot 15 \]
notice you can simplify more by dividing the bottom by 5 and the 15 (which is up top) by 5

Answer 8

45/75

Answer 9

The end answer is 9 but how do I get it?

Answer 10

when you multiply fractions you multiply top times top and bottom times bottom
if you have a whole number like 15, write it as 15/1 so it has a "bottom"

but it is better to first simply first.
you have
\[ \frac{ 3}{5} \cdot \frac{15}{1} \\ \frac{3 \cdot 15}{5\cdot 1}\]
I would not multiply 5*15 up top right away
instead, divide the bottom by 5 and the top by 5 to get smaller numbers

Answer 11

But im not multiplying

Answer 12

Im trying to find out what is 1.5/2.5 out of 15

Answer 13

and how to work it out

Answer 14

the end answer is 9

Answer 15

but how do I get it?

Answer 16

English is confusing when describing math (which is why equations are easier to understand .. once you learn how)

but you can get the idea this way:
what is 1/2 of 2 ?

notice the answer is 1. and 1/2 * 2 is also 1
It turns out the "of" means multiply

Answer 17

Oh ok

Answer 18

so try to simplify
\[ \frac{3 \cdot 15}{5\cdot 1} \]
by dividing top and bottom by 5

Answer 19

3/3

Answer 20

Cross multiply?

Answer 21

in the bottom you have a 5. divide by 5 you get 1
up top you have a 15 what is 15/5 ?

Answer 22

Once you learn the idea you will be able to do these problems

Answer 23

3

Answer 24

what we did was simplify
\[ \frac{3 \cdot 15}{5\cdot 1} = \frac{3 \cdot 3}{1\cdot 1} \]
now you can do the multiply and divide and get a simple number.

Answer 25

im so confused

Answer 26

How you get a one

Answer 27

you could have done
\[ \frac{3 \cdot 15}{5\cdot 1} = \frac{45}{5} \]
and simplify to get 9
but it's easier for me to divide the 5 into the 15 right away

Answer 28

if you have
\[ \frac{15}{5} \]
you can divide the top by 5 and the bottom by 5 to get
\[ \frac{3}{1} \]

Answer 29

Thats easier for me. Thank you

Answer 30

maybe. but notice if you had
\[ \frac{256}{32} \]
and no calculator.
It should be clear you can divide top and bottom by 2
so you could simplify the problem to
\[ \frac{128}{16} \]
and then divide top and bottom by 2 again
\[ \frac{64}{8} \]
and now you might notice 64/8 is 8

Answer 31

but if you did not notice 64/8 is 8
you could simplify by dividing top and bottom by 2 to get
32/4
and then
16/2
and then
8/1 or just 8