Posted by leah on Thursday, December 16, 2010 at 7:45pm.
You're not hopeless! You've asked a good question! :-)
When you add fractions, they both must have the same denominator. In this problem, that denominator is 16, because 16 can be divided evenly by 8.
16/8 = 2
2 * 3 = 6
3/8 = 6/16
7/16 + 6/16 = 13/16
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