Modulus is % in Construct 2
e.g. 12%10 = 2
See manual on Expressions and look under Operators
You can use the following operators in expressions:
% (modulo, remainder after division)
^ (raise to power, e.g. 5 ^ 2 = 25)
& (build strings, e.g. "Your score is: " & score)
There are also comparison operators =, <>, <, <=, >, >= for comparing values. They return 1 if the comparison is true or 0 if false.