Khan Academy
Big Bang Introduction, Scale of the Universe, Cosmology and Astronomy
Sal explains the Big Bang and the spatial concepts of infinity versus a 'sphere' of expanding matter in detail.
Curated OER
What's an Integer?
Introduce your class to integers with this video. This video provides a definition of integers, using examples of numbers that are integers and numbers that are not. A straightforward video that could be used to teach the concept as well...
Curated OER
What is the Y-Axis?
Just a simple straightforward definition and example of what constitutes the y-axis.
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What is the X-Axis?
Just a simple straightforward definition and example of what constitutes the x-axis.
Curated OER
What's an Integer?
Introduce your class to integers with this video. This video provides a definition of integers, using examples of numbers that are integers and numbers that are not. A straightforward video that could be used to teach the concept as well...
Curated OER
How Do You Graph an Inequality on a Number Line?
The teacher shows how draw a number line and graph an inequality using an open circle. She also shows how to graph a set of numbers on a number line.
Curated OER
What is a Ray?
A ray is a line that begins at an identified point and then goes on forever in one direction. The identified point is called the endpoint. There needs to be another identified point on the line to be able to identify the line as a ray....