Find the number of maps $f: \{1,2,3\} \rightarrow \{1,2,3,4,5\}$ such that $f(i) \le f(j)$ whenever $i < j$.
To find the number of maps \( f: \{1,2,3\} \rightarrow \{1,2,3,4,5\} \) such that \( f(i) \le f(j) \) whenever \( i < j \), we need to count the number of non-decreasing sequences of length 3 from the set \(\{1,2,3,4,5\}\).

1. **Understanding the problem**:
   - We need to count the number of ways to assign values to \( f(1), f(2), f(3) \) such that \( f(1) \le f(2) \le f(3) \).
   - This is equivalent to finding the number of non-decreasing sequences of length 3 from the set \(\{1,2,3,4,5\}\).

2. **Using combinatorial methods**:
   - We can use the "stars and bars" theorem to solve this problem. The number of non-decreasing sequences of length \( k \) from a set of \( n \) elements is given by the binomial coefficient \(\binom{n+k-1}{k}\).
   - Here, \( n = 5 \) (the size of the set \(\{1,2,3,4,5\}\)) and \( k = 3 \) (the length of the sequence).

3. **Applying the formula**:
   \[
   \binom{5+3-1}{3} = \binom{7}{3}
   \]

4. **Calculating the binomial coefficient**:
   \[
   \binom{7}{3} = \frac{7!}{3!(7-3)!} = \frac{7!}{3!4!} = \frac{7 \times 6 \times 5}{3 \times 2 \times 1} = 35
   \]

Therefore, the number of maps \( f: \{1,2,3\} \rightarrow \{1,2,3,4,5\} \) such that \( f(i) \le f(j) \) whenever \( i < j \) is 35.

The final answer is \(\boxed{35}\).