Now it’s time for measurement! We’re going to go over length, the length of an item, and we’re going to talk about liquid volume, which would be filling up a container and seeing how much is in the container. All right. Now with all measurement, there are two systems: the US customary system and the metric system, which is what many countries use. So we’re going to focus first on the length for the US customary system, which is inches, feet, and yards. Something that’s an inch long is the width of one of those Pink Pearl® erasers. So the width going across it – that’s an inch. Something that would be an example of a foot long would be the width of a laptop Some laptops are bigger than others, but they’re all around 1 foot. Something that’s a yard long is the width of the doorway. This may not be for a front door of a house. Sometimes those are bigger, but more like the doorway of your bedroom. If you were to take a yardstick and measure the width of your doorway and include the frame of the door, that’s going to be either exactly or around 1 yard. Now let’s focus on the metric system. Many countries talk about length in centimeters and meters because they’re in the metric system So something that’s a centimeter is the height of one of those Pink Pearl® erasers. So the height of it or the thickness of the eraser is one centimeter. Something that’s one meter long is an acoustic guitar. All right. Now pretend you have a container and you’re filling it up with water. You could talk about how many cups are in the container, how many pints, how many quarts, or how many gallons. These are all measurement units in the US system. Something that would be a cup is a small glass of water, a pint is a pint of ice cream. Now some ice cream containers are very big and some are smaller, but normally those smaller ones that you could just put a spoon right in and eat from those are a pint. A quart is more like an orange juice container and a gallon would be one of those big round containers of milk. So a gallon is bigger than a quart or a pint or a cup. In the metric system, you can fill a container and talk about it in how many liters it has. Something that’s one liter would be one of those big bottles of sodas. The kind of soda bottles you might see at a birthday party. Let’s estimate the length of this elephant. Now in order to estimate it, we need to have something to compare it to. So let’s compare the elephant to the length of this sheep. Now this sheep we’ll say that the length of it is two meters long. So how many sheep do you think it would take to match the length of the elephant? So how many meters do you think the elephant is? How long from the nose to the tail do you think the elephant is? Six meters Now we get six because it would take about three sheep to match the length of the elephant. So you can add 2 + 2 + 2=6 meters OR you can multiply it: 2 x 3=6 meters. Now let’s choose the best tool to measure the height of these flowers. Now these flowers are what you would put on top of the table. So would you measure this in yards using a yardstick? Would you measure it in inches using a ruler? Or would you measure it in meters using a meterstick? So what would be the best tool to measure the height of the flowers? Remember you can always pause during the questions to think about your answer and you can use paper and a pencil. The correct answer is B. Using a meter stick or a yardstick – that’s just too big for a pot of flowers that are sitting on a table. All right. Now let’s go over some conversions. 2.54 centimeters=one inch. So one inch is bigger than one centimeter. It takes 12 inches to make one foot. You can also think of it as 12 inches=1 foot. If you say the book is the length of 12 inches or it’s one foot, that’s the same length. 3 feet=1 yard 100 centimeters=1 meter You can also say that one meter is the same as 39 inches. You could also say that one meter is 3.3 feet. Now notice it’s exactly 3 feet to make 1 yard, but you need just a little over 3 feet to make 1 meter. For liquid volume, it takes 2 cups to make 1 pint. So if you want to make 1 pint of water in a container, you would need 2 cups. That’s going to equal 1 pint. It takes 2 pints to make 1 quart. You could also use 4 cups to make 1 quart. It takes 4 quarts to make 1 gallon. You can also make a gallon with 16 cups or you can use 3.8 liters to make one gallon And it takes 4.2 cups to make 1 liter. It takes 1.1 quarts to make 1 liter or it takes 0.3 gallons to make 1 liter. You can think of it as: it takes part of a gallon to make 1 liter. So 1 gallon is bigger than 1 liter. So how many feet are in a yard? 3 feet equals 1 yard, so these are just things to memorize. 3 feet is the same thing as 1 yard. Well because you know that, how many feet are in 4 yards? Twelve feet equals four yards. So we know three feet equals one yard and you can add 3 four times. So 3 + 3 + 3 + 3=12 feet OR you can use multiplication: 3 x 4=12 With this red triangle: When we’re talking about the area of the triangle, we’re talking about the surface, the inside space of this triangle, the inside surface of it. But when we’re talking about the perimeter of this triangle, we’re talking about the distance going around the triangle – the length of all the sides, or the length of all the edges going around it. For the perimeter, we’re not worried about the inside. We’re just focused on the outside edges – the distance going around. Now let’s find the area and the perimeter for this red square. To find the area, we can use a square inch tile. So this tile is one square inch on all of its sides, so we’ll call it a square inch. Let’s see how many tiles it takes to cover the surface of this red square. So let’s count: 1 2 3 4 5 6 7 8 9 So it took 9 tiles to cover this rectangle. So that means the area of this square is 9 square inches. For the perimeter, we’re going to focus on the lengths of the sides. So because it’s a square all the sides are going to be the same length. So 3 inches, 3 inches, 3 inches, and 3 inches. So to find the perimeter, we’re just going to add up the lengths of the sides. We’re just finding the total distance going around the square. So that would be 3 + 3 + 3 + 3=12 inches. Now notice the answers are different for area and perimeter. When we’re talking about area, we say 9 square inches. But for perimeter, we’re just talking about the distance so it’s just inches. So what is the perimeter of this rectangle? It’s 12 inches. So we add up 4 + 2 + 4 + 2 and that gives us the total distance going around this rectangle=12 inches. What’s the area of this rectangle? So this is the same sized rectangle and how can we find the area? Here’s our tile again. We have our square inch tile. So how many tiles does it take? So what’s the area of this rectangle? 8 square inches Next is part 3 where we review time and temperature. ๐

0:00 Length units with examples – inches, feet, yards & centimeters and meters

1:36 Liquid Volume with examples – cups, pints, quarts, gallons & liters

2:38 Questions – estimate length, choose best measurement tool

4:15 Equivalent measurements

6:02 Questions – conversion

6:47 Area vs. Perimeter

8:47 Questions – find perimeter & area for rectangle

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