Final answer:
To create 5 trapezoids using pattern block triangles, where each trapezoid consists of 3 triangles, you would need 15 triangles in total.
Step-by-step explanation:
We'll need to know the number of pattern block triangles that make up one trapezoid to solve this. It's a common geometrical exercise in which we break down complex shapes into simpler ones. Typically, a trapezoid in pattern blocks is made up of a certain number of triangles. Assuming that the number of triangles that form one of these trapezoids is 3 (as is common with pattern block sets), then we can determine the number needed for 5 trapezoids.
You multiply the number of triangles needed to create one trapezoid by the number of trapezoids you want. So, if one trapezoid is formed by 3 triangles, 5 trapezoids would require 5 times that number. That gives us:
3 triangles/trapezoid × 5 trapezoids = 15 triangles.
Therefore, you would need 15 pattern block triangles to create 5 trapezoids. This can also be a valuable exercise in understanding shapes, number patterns, and basic multiplication.