Answer :

ashheather1
turn the fractions into fractions with common denomenators and then subtract numerators. 

20 is a common factor 

3/10 x 2 = 6/20

1/4 x 5 = 5/20

6/20 - 5/20 is 1/20 so that should be your answer :)
altavistard
It's best to identify and then use the LCD.

The LCD here is 20; both 10 and 4 divide evenly into 20.

Thus, we have 6/20 - 5/20 = 1/20, or 0.05 (answer)  

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