What is least to greatest with these following numbers ? -0.615,-5/8,-0.62

First, you need to convert them all to the same type of number.  This means converting -5/8 to a decimal.  When divided, -5/8 equals -0.625.  

So in order from least to greatest is -5/8, -0.62, -0.615

You might think that this is backwards, but it is not, because if you have a large negative number it has less value then a lower negative number.

Uneed to add them up 27+18+23=68

I’m not sure about that