Khan Academy on a Stick
Measurement
From length to area to volume to time, thinking about how we measure things.
Introduction to area and unit squares
Measuring the same rectangle with different unit squares
Rectangle area as product of dimensions same as counting unit squares
Area of rectangles and the distributive property
Comparing areas of plots of land
Calculating the square footage of a houseArea basics
Area is how we thinking about how much space something takes in two dimensions such as comparing how much land one property takes up versus another. In this tutorial, we'll take a conceptual look at how area is actually measured (especially for rectangles).
Introduction to perimeter
Perimeter of a shape
Comparing areas and perimeters of rectanglesPerimeter
Have you ever wondered how much fencing you need to surround a plot of land? No? Well, you should still go through this tutorial just in case. You'll learn all about how to think about and calculate perimeter--essentially the length of the boundary of a figure.
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Area and perimeter word problem: table dimensions
If you know the area and perimeter of a rectangle, you can figure out the length and width. STILL don't believe us?Just watch.
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Finding width from perimeter and length
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Area and perimeter word problem: comparing areas of rectangles
We know the length and width of two rectangles. Guess what? We can compare the areas!
Rectangle area and perimeter word problems
In this tutorial, you'll stretch your understanding of area and perimeter by applying it to word problems.
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Volume: how measure it
Volume is a measurement in the 3rd dimension. This means that it not only has width and height, but it has depth as well. Let's watch this video in which we get a great explanation of how we measure volume.
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Volume: measuring with unit cubes
Volume is usually measured in cubic feet (or inches, or centimeters, etc). Let's practice counting cubic feet in order to find the volume.
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Volume: measuring as area times length
Sometimes, we can't just count the number of cubes to find the volume because there are too many. In those situations, you need another way of measuring volume. This video gives you the solution.
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Volume of a rectangular prism or box examples
Let's do some example problems together in which we use the area times length formula for finding volume.
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Volume word problem
Perhaps you've noticed that after teaching you the concept and doing a few example problems together, we always like to throw you a word problem in which you have to apply what you've learned. So here let's find the volume!
Volume of a box or rectangular prism
Volume measures how much 3-dimensional "space" an object takes up. We'll see in this tutorial that it is an extension of length (1-D) or area (2-D) to three dimensions!