Example: 502 (five hundred and two) could be mistaken for 52 (fifty two) without the zero in the tens place.
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Zero is neither negative nor positive. But it is an even number.
The idea of zero, though natural khổng lồ us now, was not natural to lớn early humans ... If there is nothing khổng lồ count, how can we count it?
Example: you can count dogs, but you can"t count an empty space:
An empty patch of grass is just an empty patch of grass!
Zero as a Placeholder
But about 3,000 years ago people needed khổng lồ tell the difference between numbers lượt thích 4 and 40. Without the zero they look the same!
So zero is now used as a "placeholder": it shows "there is no number at this place", lượt thích this:
This means 5 hundreds, no tens, và 2 ones
The Value of Zero
Then people started thinking of zero as an actual number.
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"I had 3 oranges, then I ate the 3 oranges, now I have zero oranges...!"
And zero has a special property: when we showroom it lớn a number we get that number back, unchanged
7 + 0 = 7
Adding 0 to 7 gives the answer 7
Also 0 + 7 = 7
This makes it the Additive Identity, which is just a special way of saying "add 0 and we get the identical (same) number we started with".
Here are some of zero"s properties:
|a + 0 = a||4 + 0 = 4|
|a − 0 = a||4 − 0 = 4|
|a × 0 = 0||6 × 0 = 0|
|0 / a = 0||0/3 = 0|
|a / 0 = undefined (dividing by zero is undefined)||7/0 = undefined|
|0a = 0 (a is positive)||04 = 0|
|00 = indeterminate||00 = indeterminate|
|0a = undefined (a is negative)||0-2 = undefined|
|0! = 1 ("!" is the factorial function)||0! = 1|
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