Posted by dawn on Thursday, June 26, 2008 at 9:14pm.
Four buttons have diameters of 5/8 3/4, 9/16, and 7/8 inches. Which button is smallest?
A) 7/8 B) 5/8 C) 3/4 D) 9/16
i wanna say the answer is 3/4

math  Reiny, Thursday, June 26, 2008 at 9:33pm
rewrite each with a common denominator of 16
5/8 = 10/16
3/4 = 12/16
9/16 = 9/16
7/8 = 14/16
Can you tell now?
or
change each fraction to a decimal by dividing top by bottom. 
math  Ms. Sue, Thursday, June 26, 2008 at 9:34pm
The way to decide this answer is to change all of these fractions so that they have the same denominator. In other words, find the least common multiple.
7/8 = 14/16
5/8 = 10/16
3/4 = 12/16
9/16 = 9/16
Which is the smallest numerator? 
math  dawn, Thursday, June 26, 2008 at 9:38pm
9/16 = 9/16

math  Ms. Sue, Thursday, June 26, 2008 at 9:45pm
Right. The smallest button is 9/16 inch.