The **Multiplying Area with unit squares** exercise falls under the 3rd grade (U.S.) 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, user has an irregular polygon in a square grid with side length one unit(its area should be one unit). They need to figure out the area of the whole polygon(shaded in blue).

2. User has an irregular polygon made out of squares and triangles/ they need to find its area. It may look confusing. But the trick is: They 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 user needs to first count the squares and groups of two triangles.

## Real-life Applications

- The ancient Egyptians from over 4000 years ago were very good at shapes and geometry. Every time the Nile burst its banks and flooded the planes, they had to use geometry to measure their gardens and fields all over again.