You thought you knew.
Here in this video, we finally cross (under) this critical bridge: The Bridge of Deafinition.
A number is a name (a unique name).
That name identifies a measurement (an exact measurement).
That measurement is the answer you got when you took two amounts and compared them, using one as your Mystery Amount and one as your Measure.
In other words, you asked yourself: "How many of these (Measures) is this (Mystery Amount)?". And then you got an answer -- an exact answer.
Remember it has to be an exact answer. Otherwise, it is not a number. "Three, plus a little bit," is not a number. "A little bit more than one and four-tenths" is not a number. This will become important for you later, believe me! Really, I guess it's already important for you now.
So the way we are going to say the name that is a number is this:
[However many the Mystery Amount is] measured by [however many the Measure is].
For examples:
Four measured by one.
Twelve measured by two.
Eight measured by four.
Eleven measured by two.
These are all wonderful, perfectly good, clearly defined, NUMBERS.
Негізгі бет The Eighth Big Idea: What a NUMBER Is
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