Don't be underestimating yourself! You are a good player, especially in the 'efficiency rating' (using minimal number of operations to get the results).
Here's my approach using 4,5,7,9,11,15:
15 × 7 = 105
105 + 11 = 116
116 × 4 = 464
Here's my approach using 4,5,7,9,11,15:
15 × 7 = 105
105 + 11 = 116
116 × 4 = 464