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This Ruby tutorial talks about operators, such as +, , /, *, etc.
Math Operators
Here is a list of the math operators in Ruby, and what they are in Scratch.
Ruby  Scratch Version 

x + y 
(x) + (y)

x  y 
(x)  (y)

x / y 
(x) / (y)

x * y 
(x) * (y)

Exponents
In Ruby, numbers can be raised to any power easily, using x ** y
In Scratch, this is a little more complicated (see Solving Exponents)
Operators Such as And, Or, Etc.
x > y  y > x
 Is x greater than y or y greater than x? If either of them are, x > y  y > x equals
true
. If neither of them are, returnsfalse
.  In Scratch:
<(x) > (y)> or <(y) > (x)>
 Is x greater than y or y greater than x? If either of them are, x > y  y > x equals