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help me expand this calculation so that I understand the result please. why is 1-(10/75) = 13/15 ?

 Oct 6, 2019
 #1
avatar+2417 
+2

Don't simplify 10/75

 

First, do 1 - (10/75)

 

(75/75) - (10/75)   =    65/75

 

THEN simplify

 

13/15

 Oct 6, 2019
 #2
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+1

Thank you very much!! smiley

Guest Oct 6, 2019
 #3
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+1

 

help me expand this calculation so that I understand the result please. why is 1-(10/75) = 13/15 ?    

 

CU's way is very good, but you could reduce 10/75 first if you wanted to. 

 

we're starting with                                                               1 – (10/75) 

 

reduce 10/75 by dividing both top and bottom by 5            1 – (2/15)

 

since 1 = 15/15                                                                   (15/15) – (2/15)  =  13/15 

 

.

 Oct 7, 2019
 #4
avatar+974 
+2

You could also see that 1 = 13/15 + 10/75

However, CU and Guest's method would probably be better.

 

You are very welcome!

:P

 Oct 7, 2019

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