# math

posted by sam

how do you do the following? 9/10 - ?= 17/30 and 3/10 + 4/5 = ? first time doing this . Thank you

1. Ms. Sue

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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3/10 + 4/5 = ?

3/10 + 8/10 = 11/10 = 1 1/10

http://www.math.com/school/subject1/lessons/S1U4L3GL.html

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