math
posted by sam on .
how do you do the following? 9/10  ?= 17/30 and 3/10 + 4/5 = ? first time doing this . Thank you

To add and subtract fractions, they need to have the same denominator.
9/10  ?= 17/30
 x = 17/30  9/10
x = 17/30  27/30
x = 10/30 = 1/3
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3/10 + 4/5 = ?
3/10 + 8/10 = 11/10 = 1 1/10
http://www.math.com/school/subject1/lessons/S1U4L3GL.html