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