Multiplying area with unit squares

The Multiplying Area with unit squares exercise falls under the 3rd Grade Math Mission.

Types of problems
There are two types of problems in this exercise. 1. Each square in the grid is a unit square with an area of 1 square unit. What is the area of the striped shape? In this problem, you have an irregular polygon in a square grid with side length one unit(its area should be one unit). You need to figure out the area of the whole polygon(shaded in purple). 2. You have an irregular polygon made out of squares and triangles/ you need to find its area. It may look confusing. But the trick is: You need to count the square and add the no. of triangles in pairs(two triangles make one square in the figure)

Strategies
It is tough to get it speed badges in this skill. The first problem takes less time. But the second one may take a lot of time as you need to first count the squares and groups of two triangles.