Posted by **Kathleen** on Monday, April 23, 2007 at 9:59am.

I cannot get my brain around questions like this:

1/4 divided by 2/5 = 2/4 x ?

I have 4 problems like this and even the example doesn't make sense - I may have copied it wrong off of the board.

Can anyone help?

Thank you!

You invert the second fraction and then just multiply.

1/4 divided by 2/5 = 1/4 multiplied by 5/2

What do you get?

??

(Broken Link Removed)

Click on Dividing Fractions and then on the first link in that section.

=)

OK - I GOT 10/8THS OR REDUCED I GET 1 1/4. IS THAT RIGHT?

NOW I JUST WANT TO LEARN WHY I INVERT THE 2ND FRACTION.

THANK YOU SO MUCH!

There are really only two basic operations in arithmetic, addition and multiplication.

subtraction is just the inverse operation of addition.

e.g. 12 + 5=17

17 - 5 = 17 + (-5)=12

so to subtract we simply add the opposite

likewise, division is the inverse operation to multiplication

eg. 12 x 4 = 48

and 48 ÷ 4 = 12

but 48 x 1/4 = 12

take 1/4 of $48 and you would get $12

divide $48 by 4 and you would get $12

**I wrote:**
You invert the second fraction and then just multiply.

1/4 divided by 2/5 = 1/4 multiplied by 5/2

What do you get?

??

**You wrote:**
OK - I GOT 10/8THS OR REDUCED I GET 1 1/4. IS THAT RIGHT?

**How did you get 10/8?
**

1/4 divided by 2/5 = 1/4 multiplied by 5/2

When you multiply 1 x 5, you should get 5.

When you multiply 4 x 2, you should get 8.

5/8 is the answer.

=)

12

how do you concentrate
- 5th Grade Math -
**Laura Lopez**, Monday, September 17, 2007 at 9:41pm
I need help in log divided

- 5th Grade Math -
**meagan**, Monday, April 7, 2008 at 6:09pm
how do you do metric measurement

- 5th Grade Math -
**Joshua**, Thursday, May 1, 2008 at 9:04pm
I need help on how to use an equation to graph?

Here is an example from the text book.

y=x-4

example shows x= -2 -1 1 2

y= -6 -5 -3 -2

I want know how did they show this relationship.

- 5th Grade Math -
**Briana Thompson**, Tuesday, August 26, 2008 at 6:58pm
I am having problems with writing fractions. For example, four and fifty-six hundredths. How can I write this as a fraction? Please respond.

## Answer This Question

## Related Questions

- algebra - I have a few math questions I made them just like my actual problems ...
- biology help please - Compare the pig brain to drawings of a human brain, a ...
- physics - thanks for the help for before I have a new question now... figures ...
- math - need help to solve the following ploblem, and like problems: 5 minutes = ...
- math - How to do polynaimals in 5th grade in the easyest form. How do you do ...
- Maths (Simultaneous equations) - You know f(x)= ax˛ + bx + c. Well when you get ...
- 5th grade Math - I have a review question that says: The formula for the ...
- Science - I'm a little confused when it comes to significant figures. Where it ...
- spanish - I want to write sentences about asking people questions. The questions...
- MATH - ok so I'm learning to solve problems like cos(x)=2 and sin(x)=5 I've ...

More Related Questions