To factor the expression \(30z + 40\), we first identify the greatest common factor (GCF) of the two terms:
- The coefficients 30 and 40 have a GCF of 10.
Now we can factor out 10 from each term:
\[ 30z + 40 = 10(3z + 4) \]
Thus, the factored form of the expression is:
\[ 10(3z + 4) \]
So, the answer is \(10(3z + 4)\) where the whole number greater than 1 is 10.