simple math question (1 Viewer)

[NewlyRetired]

Can some one break down the steps to do the following? I am having a hard time explaining to daughter

a/b/c

(a divided b divided by c) with fractions

for example:

(1/3)/(2/3)/(3/4)

 

[ghostguy123]

Go in order???

 

[shady inc]

Please Excuse My Dear Aunt Sally

 

[NewlyRetired]

Go in order???

I mean in terms of fractions.

something like (1/3)/(2/3)/(3/4)

Does this work out to:

(1/3)*(3/2) = 1/2

(1/2)*(4/3) = 2/3

final answer of 2/3?

or when it is 3 fractions is some other order needed?

 

[sbonomo]

what doesn't she understand about how you have written it above?

 

[Galileo]

Go in order???

This. Find a/b then take the result and divide by c.

Now a/(b/c) is a different animal...

 

[McGarnicle]

The doctor is the boy's mother.

 

[NewlyRetired]

what doesn't she understand about how you have written it above?

Is what I wrote correct?

 

[Galileo]

Go in order???

I mean in terms of fractions.

something like (1/3)/(2/3)/(3/4)

Does this work out to:

(1/3)*(3/2) = 1/2

(1/2)*(4/3) = 2/3

final answer of 2/3?

or when it is 3 fractions is some other order needed?

This is correct

 

[NewlyRetired]

Go in order???

I mean in terms of fractions.

something like (1/3)/(2/3)/(3/4)

Does this work out to:

(1/3)*(3/2) = 1/2

(1/2)*(4/3) = 2/3

final answer of 2/3?

or when it is 3 fractions is some other order needed?

This is correct

Thanks. Her problem is significantly more complicated (beginning of precalc) but I am trying to simplify things for her so that she can see that even though she has many variables, she can still go back to her basics.

 

[ghostguy123]

Go.....in.......order

 

[ghostguy123]

The doctor is the boy's mother.

I have no idea why but I laughed at this

 

[Mr. Ected]

Found a site called Purple Math, and it allowed me to enter a problem to solve. It didn't show steps (have to join, not paying money!) but the solution was what you suggested.

And for the steps, aren't you allowed to move items around with multiplication and division? Kinda like a*b*c = c*a*b or a/b/c = c/a/b. This would allow you to do items that went together better. Forget the teminology, but I seem to remember that.

I may be nuts though!

 

[ghostguy123]

U are nuts. Does not compute for division.

Wow. I didnt realize the FFA would struggle with this simple math.

 

[FUBAR]

I like Pi

 

[Hooper31]

Please Excuse My Dear Aunt Sally

This is often a problem for students because its incomplete. PEMDAS is a nice start, but problems start to occur when people falsely believe that multiply has to happen before divide and addition has to occur before subtraction.

When deciding between MD and AS you have to work from left to right.

PE(MD)(AS) is a bit better, but still not perfect. Not sure how to best convey the order properly. I'm open if anyone has any ideas I can share with my students.

 

[ghostguy123]

Please Excuse My Dear Aunt Sally

This is often a problem for students because its incomplete. PEMDAS is a nice start, but problems start to occur when people falsely believe that multiply has to happen before divide and addition has to occur before subtraction.

When deciding between MD and AS you have to work from left to right.

PE(MD)(AS) is a bit better, but still not perfect. Not sure how to best convey the order properly. I'm open if anyone has any ideas I can share with my students.

Go in order.........left to right.......× and ÷ in order. Then go back and + and -.........in order. If it helps, put things in ( ) before starting.

Its very simple. Do many examples on the ol blackboard

 

[the moops]

Found a site called Purple Math, and it allowed me to enter a problem to solve. It didn't show steps (have to join, not paying money!) but the solution was what you suggested.

We really need a website to do multiplication for us?

 

[xulf]

Please Excuse My Dear Aunt Sally

This is often a problem for students because its incomplete. PEMDAS is a nice start, but problems start to occur when people falsely believe that multiply has to happen before divide and addition has to occur before subtraction.

When deciding between MD and AS you have to work from left to right.

PE(MD)(AS) is a bit better, but still not perfect. Not sure how to best convey the order properly. I'm open if anyone has any ideas I can share with my students.

Go in order.........left to right.......× and ÷ in order. Then go back and + and -.........in order. If it helps, put things in ( ) before starting.

Its very simple. Do many examples on the ol blackboard

What is your suggestion for the overuse of periods?

 

[ghostguy123]

reverse order

 

[Officer Pete Malloy]

Fractions suck. Convert to decimals and then multiply.

.16

 

[Mr. Ected]

Found a site called Purple Math, and it allowed me to enter a problem to solve. It didn't show steps (have to join, not paying money!) but the solution was what you suggested.

We really need a website to do multiplication for us?

It's actually a site that does explanations for math. one feature is the ability to show solutions for problems. Nice site with decent explanations, will keep in mind for assistance for my kids.

 

[Chemical X]

if she doesnt know this how will she ever get a job?

 

[sports_fan]

My math skills have deteriorated rapidly since finishing school

 

[jon_mx]

Can some one break down the steps to do the following? I am having a hard time explaining to daughter

a/b/c

(a divided b divided by c) with fractions

for example:

(1/3)/(2/3)/(3/4)

Simpliest way is make this a * c * (1/b), because dividing the whole denominator is the same as just multiplying.....so you have (1/3)*(4/3)*(3/2) = 12/18 = 2/3

 

[the moops]

that is nowhere near the simplest way. it also appears to be wrong.

 

[jon_mx]

that is nowhere near the simplest way. it also appears to be wrong.

Yeah, I think you are right. The order of operations assumes the first two fractors are divided first. There is an implied parathesis around the first two fractions. Ugh. It is not a way you should write out a problem.

 

[Bonfire]

1812!

Gettysburg!

16 fluid ounces!

I before E!

Thomas Edison!

 

[Notorious T.R.E.]

Try using the PhotoMath App on it

 

[Notorious T.R.E.]

Try using the PhotoMath App on it

Just did it...pretty cool

 

[NewlyRetired]

that is nowhere near the simplest way. it also appears to be wrong.

I did not check his method but others above said the final answer was 2/3.

What is the correct final answer if 2/3 is wrong?

 

[the moops]

his answer was correct. his work was not