College Algebra / Unit 8 Alg 429 short lesson, about 20 seconds
Common and Natural Logarithms
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The idea
A common logarithm is base 10, written log(x) with no base shown; a natural logarithm is base e, written ln(x).
In practice
log(1000) = 3, since 10³ = 1000; ln(e) = 1, since e¹ = e. Two named bases, two shorthands.
Where people slip
A baseless log in this course means base 10, per the anchor.
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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