Homework Help: math

Posted by Anonymous on Friday, August 7, 2009 at 11:17pm.

I was wondering if someone could help guide me with this problem.. math is my worst subject... I would appreciate it definately, thank you..

3 1/5 divided by 7/8 x 2/3=

I think I am making it too hard on myself... my first step would be to change the mixed into an improper which is 16/5
and the second step would be to find the common denominator is this correct? and if so what do I do since I cannot find the LCD of 5,8, and 3?

math - Thara (i think, not sure), Saturday, August 8, 2009 at 4:08am
(16/5) / (7/8) * (2/3)

(5/16) * (7/8) * (2/3)

i multiplied the by 3,6, and 16.

15/48 * 42/48 * 32/48= 20,160/48 reduce it to--> 420/1.

----------or----------------------

(16/5) / (7/8) * (2/3)

(16/5) * (8/7) * (2/3)

i multiplied by 21, 15, and 35.

336/105 * 120/105 * 70/105

P.S. i know that when there is Dividing i knoe that we have to change that division into multiplication, and when changing the multipllication we have to rotate one of the fraction. Im just not sure if we rotate the first one or the second one, so i did it for both. I hope this answers your questions!!!:)
math - drwls, Saturday, August 8, 2009 at 9:20am
[3 1/5 divided by 7/8] x 2/3
= 16/5 * 8/7* 2/3 = 256/105

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