Geometry - 3rd grade

Learn how to find the area of a compound rectangular shape! We divided it into two rectangles, find the area of each separately, and lastly add. Math Mammoth Grade 3 Curriculum Area and Perimeter Builder (online activity)

Learn how to find the area of a compound rectangular shape! We divided it into two rectangles, find the area of each separately, and lastly add. Math Mammoth Grade 3 Curriculum Area and Perimeter Builder (online activity)

We look at rectangles that are divided into two parts. Then, the area of the entire rectangle is the sum of the areas of the two parts. (This is the distributive property in action.) For example, let's say the larger rectangle is 4 by 7 units, and it's divided into parts that are 4 by 2 and 4 by 5 units. Then: 4 x 7 = 4 x 2 + 4 x 5 and also: 4 x (2 + 5) = 4 x 2 + 4 x 5. We practice this concept with several exercises in the video. Math Mammoth Grade 3 Curriculum Area and Perimeter Builder (online activity)

We look at rectangles that are divided into two parts. Then, the area of the entire rectangle is the sum of the areas of the two parts. (This is the distributive property in action.) For example, let's say the larger rectangle is 4 by 7 units, and it's divided into parts that are 4 by 2 and 4 by 5 units. Then: 4 x 7 = 4 x 2 + 4 x 5 and also: 4 x (2 + 5) = 4 x 2 + 4 x 5. We practice this concept with several exercises in the video. Math Mammoth Grade 3 Curriculum Area and Perimeter Builder (online activity)

The basic idea in AREA is that we cover the shape with little squares. The number of those squares is its area. The area of a rectangle can be found by multiplying. In my example, the rectangle is in a grid. We can count the number of columns and rows, and multiply those to get the area. Math Mammoth Grade 3 Curriculum Area & Perimeter Builder - online activity

The basic idea in AREA is that we cover the shape with little squares. The number of those squares is its area. The area of a rectangle can be found by multiplying. In my example, the rectangle is in a grid. We can count the number of columns and rows, and multiply those to get the area. Math Mammoth Grade 3 Curriculum Area & Perimeter Builder - online activity

In this lesson, we draw different rectangles that all have an area of 20 square units, and find the perimeter of those. Area and Perimeter Builder - online activity Math Mammoth Grade curriculum

In this lesson, we draw different rectangles that all have an area of 20 square units, and find the perimeter of those. Area and Perimeter Builder - online activity Math Mammoth Grade curriculum

First I remind viewers of the concepts of area and perimeter and how they differ from each other. Then we find the area and perimeter of a somewhat complex rectilinear figure - not all its side lengths are even given, so we need to figure those out. Lastly, there's a little puzzle to solve: draw a rectangle with the given area and perimeter. Area and Perimeter Builder - online activity Math Mammoth Grade curriculum

First I remind viewers of the concepts of area and perimeter and how they differ from each other. Then we find the area and perimeter of a somewhat complex rectilinear figure - not all its side lengths are even given, so we need to figure those out. Lastly, there's a little puzzle to solve: draw a rectangle with the given area and perimeter. Area and Perimeter Builder - online activity Math Mammoth Grade curriculum