How do you evaluate #3/ 10+ ( - 1/ 5)#?

1 Answer
smendyka
Oct 9, 2017

See a solution process below:

Explanation:

First, rewrite the expression as:

#3/10 - 1/5#

To add or subtract fractions they must be over a common denominator. Multiply the fraction on the right by the appropriate form of #1# to put it over a common denominator while not changing the value of the fraction:

#3/10 - (2/2 xx 1/5)# =>

#3/10 - (2 xx 1)/(2 xx 5)# =>

#3/10 - 2/10#

Now, subtract the numerators over the common denominator:

#(3 - 2)/10 =>#

#1/10#

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