College Algebra / Unit 1 Alg 001 short lesson, about 20 seconds
The Real Numbers
Captions available
The idea
The real numbers are all the numbers on the number line: every rational number and every irrational number, with no gaps.
In practice
A ruler's edge is a picture of the set: 2, −3, ½, and π each mark one point, and every point marks one number.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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