Hello everyone! Today, we’re going to learn about something called “perimeter.” It’s a fun way to find out how long the border of a shape is. Let’s get started!
Perimeter is the distance all around a shape. To find it, you just add up the lengths of all the sides of the shape. It doesn’t matter if the shape has three sides, like a triangle, or four sides, like a rectangle, or even more sides. Just add them all together!
Let’s look at some examples to make it easy to understand.
Imagine a rectangle with sides that are two inches and three inches long. To find the perimeter, we can add the sides together. Here’s a trick: add the same numbers first!
First, add two plus two, which equals four. Then, add three plus three, which equals six. Now, add those two sums together: four plus six equals ten. So, the perimeter of this rectangle is ten inches!
Now, let’s look at a triangle with three sides, each four inches long. Start by adding two of the sides: four plus four equals eight. Then, add the last side: eight plus four equals twelve. The perimeter of this triangle is twelve inches!
Squares are special because all their sides are the same length. If each side of a square is six inches, you can add them up one by one. First, add six plus six to get twelve. Then, add twelve plus twelve to get twenty-four. So, the perimeter of this square is twenty-four inches!
Let’s try another rectangle with sides of seven inches and three inches. Add the same numbers first: seven plus seven equals fourteen, and three plus three equals six. Now, add those sums: fourteen plus six equals twenty. The perimeter is twenty inches!
There’s another way to do it: add seven plus three to get ten, then add another ten. Ten plus ten equals twenty. See how easy it is?
When you find the perimeter, try to make two simple problems. You can use doubles or friendly numbers to make it easier. Then, add those sums together to get the perimeter.
Thanks for learning with us! Keep practicing, and you’ll be a perimeter pro in no time!
Perimeter Hunt: Go on a perimeter hunt around your home or classroom! Find different objects like a book, a table, or a picture frame. Use a ruler or a measuring tape to measure each side of the object. Write down the measurements and add them up to find the perimeter of each object. Share your findings with a friend or family member and see who can find the object with the largest perimeter!
Shape Creations: Use craft sticks, straws, or string to create different shapes. Make a triangle, rectangle, and square. Measure each side with a ruler and calculate the perimeter of each shape. Try creating a new shape with more sides and find its perimeter. Discuss with your classmates or family how the perimeter changes with different shapes and sizes.
Perimeter Story Time: Imagine you are designing a garden with different shaped flower beds. Draw a picture of your garden with at least three different shapes. Label the sides of each shape with measurements and calculate the perimeter of each flower bed. Write a short story about your garden, explaining why you chose those shapes and how you calculated the perimeter to plan your garden layout.
Here’s a sanitized version of the provided YouTube transcript:
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Welcome to Kids Academy! Hello everyone! Let’s open the worksheet. Don’t forget to like this video and subscribe to our channel. You can find the link to this app in the comments below. Today, we’re going to be looking at a worksheet called “Calculating Perimeter.”
Perimeter is the distance around a shape. You find the perimeter by adding the lengths of all the sides together. It doesn’t matter if there are three sides, like in a triangle, or four sides, like in a rectangle, or five sides, like in a pentagon, or even a hundred sides—just add the sides together.
Making your work nice and neat is a great way to make these problems even easier. I have a few tricks to show you with some of these shapes. Let’s read the directions and get started right away. In each row, check the correct perimeter. Remember, we’re just adding the sides together.
In this first example, we have a rectangle with sides of two inches and two inches, and three inches and three inches. My favorite strategy for finding the perimeter of a rectangle is to add the doubles together first, then take the sums of the two doubles and add those together to give you the total perimeter.
So let’s start by adding two plus two. This addition problem gives us a sum of four. Our second pair of sides that we have to add together is three plus three, which equals six. Now we have our two sums: four plus six.
Four plus six gives us a total perimeter of ten. So the perimeter for this problem is ten. You could have added two plus two plus three plus three, but breaking it into two smaller problems and then adding the sums is a nice, easy way to find the perimeter.
Let’s take a look at the next example. In this problem, we have a triangle with three sides. Each side has a length of four inches. Again, even though there are only three sides, I want to make an easy problem first. The first thing I’m going to do is just add these two fours.
Four plus four is eight. Now, all you have to do is add this other four to the sum of four plus four. Eight plus four gives you a total perimeter of twelve inches. Remember, making your work easier is the best way to do this.
Let’s take a look at the next example. In this problem, we have a square. In a square, we know all sides are equal, and in this square, each side happens to be six inches. Instead of adding all the sixes together at once, let’s do it one at a time.
Six plus six gives us twelve. Now we have to add twelve plus twelve. This problem is a little bit more difficult, so let’s line it up vertically and add by place. Two plus two is four, and one plus one is two, giving us a total of twenty-four. That means the perimeter of this square is twenty-four.
In our last example, we have another rectangle. The sides of this rectangle are seven inches and seven inches, and three inches and three inches. Again, let’s make two easy problems. We can add the doubles and then solve three plus three, which equals six, and seven plus seven, which gives us fourteen.
Now we can just add six plus fourteen. This gives us a perimeter of twenty. Believe it or not, there’s another easy way you could have solved for the perimeter.
Instead of using doubles, I can use friendly numbers. Seven plus three equals ten. Now I can add my two tens together, and everybody knows ten plus ten equals twenty, giving you a perimeter of twenty.
So, always write your perimeter problems easily. Try to make two simple problems, whether it’s doubles or friendly numbers, and then add those sums together to find the perimeter.
Thanks for watching! We’ll see you next time. Don’t forget to like us and subscribe to our channel. Find links to our apps in the comments below.
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This version removes any informal language and maintains a clear, educational tone.
