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What is the common demonitor of 2/5 and 7/8 - Office Equipment & Supplies

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I don't know if it just me, but when doing these questions, I always think about PIZZA.

You have one pizza divided into 5 equal pieces, and 3 are gone, leaving 2. The other pizza is divided into 8 equal pieces and only 1 piece is left.

You have the pizza cutter in your hand. How many pieces do you have to cut each pizza into to be able to describe how much pizza you have in total?

In this case, you would have to cut each pizza into 40 pieces. To determine that it is 40, we do the multiples of 5, being 5, 10, 15, 20, 25, 30, 35, 40, 45, etc. We also do the multiples of 8, being 8, 16, 24, 32, 40, 48. What is the first number that is common to both lists? In this case, it is 40.
Since we have to multiply the 5 by 8 to get 40, we have to multiply the 2 by 8 to get the numerator. We have to do the same with 1/8.

Good luck.


Posted on Mar 07, 2016


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Posted on Jan 02, 2017


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Can you please help me in exponents when it deals with fraction

I interpreted the question as:

(x-2)/(4-x) + 2/3 = (x-2)/12 or

(x-2) 2 (x-2)
------ + --- = -----
(4-x) 3 12

Now to find a common denominator.

I factor all the terms and see what is common, so it can be eliminated to leave the lowest common denominator.

(4 - x) - prime - cannot be factored

3 - prime - cannot be factored

12 - 4 x 3

What is common in the above? The 3, so we can eliminate one 3.

Common denominator - (4 -x) (3)(4)

So, we must multiply the numerator and denominator of the first term by 12 (3 x 4).

The next term's numerator and denominator must be multiplied by 4(4-x).

The term on the right of the equals sign must have the numerator and denominator multiplied by (4-x).

Good luck.

If you need more assistance, post again.


Apr 02, 2018 | Homework

4 Answers

I need help with greatest common multiples i am haveing troubles

Understand the process first and then go for an example:
How to do?
1. Make a list of multiples for each number
2. Continue your list until at least two multiples are common to all lists
3. Identify the common multiples

example_ find common multiples for two numbers_ 10 and 25-hw01nkm5y1qvuh0mvcthmqik-1-2.png Still have confusion? Consult an expert Algebra Tutor!

Sep 19, 2017 | Office Equipment & Supplies

1 Answer

Ways to find highest common factors?

Do a prime factorization of the two numbers. Use condensed (power) notation for each prime factor.
2 is a factor in N1 and N2, the smallest power of 2 is 4, thus 2^4 is common to N1, and N1. You could write 2^5=2*2^4
11 is a factor in N1, and N2, the smallest exponent of 11 is 1, thus 11 is a common factor of N1 and N2.
Highest common factor of N1 and N2 is (2^4)*11

Sep 02, 2014 | Mathsoft Computers & Internet

1 Answer

Khan academy

1/1-x -1/x =1/2 why does the common denominator become (x-1) x 2

I assume this is (1 / (1-x)) - (1 / x) first, this

= (x - (1-x)) / (x (1-x))

= (2x - 1) / (x - x^2) which is your question, and this

= 1/2 so

2 (2x - 1) = x - x^2

4x - 2 = x - x^2

x^2 + 3x - 2 = 0

May 25, 2014 | Computers & Internet

1 Answer

Find a common denominator for each pair of fractions. Then rename each fraction in the pair

12 has factors 2*2*3
8 has factors 2*2*2
So lowest common denominator is 2*2*2*3 or 24

3/12 = 6/24 and 3/8 = 9/24

Jan 16, 2014 | Mathsoft Computers & Internet

1 Answer

Highest common factor

Math is fun has a great article on how to find the GCF of two numbers:

To find the common factors, you have to list all factors of both numbers:
96: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
124: 1, 2, 4, 31, 62, 124

Oct 21, 2013 | Android Apps

1 Answer

Hello. I have a LER8648PQ1 and it is dead. Has power. I have removed top, and see door switch. How to ohm it out with 3 leads?? I expected 2. Thanks.


The 3 wires comprise 2 for the motor circuit and the second circuit for the drum light..too check it their will be one wire by itself it will be common when the door is closed the common and one of the other 2 wires will have a circuit and when door is open the common and the wires that didnt have a curcuit before will have contunuty
while i know all 3 wires are white the one byitself will be common and of of the other 2 will be marked NO and the other marked NC
when door is closed the circuit should be on the COMMON &NO wire
when door open the circuit should be COMMON& NC

but in addation the door switch the most common part bad when dryer doesnt start will be the thermal will be in the blower/lint filter housing and only have 2 wires (both blue i believe) and have contunuty at all times if good and a open circuit if bad

This is what the thermal fuse looks likeoldtech2332_94.jpg

Sep 05, 2011 | Whirlpool Dryers

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1.2c 2.x 3.8ac 4 .2ac 5.12r...hope these answers are helpful to you..

Jun 22, 2009 | Vivendi [email protected] Mathematics Study Skills...

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