Mathematics is the science of numbers as Aristotle defined. Here we have collected all the important mathematics definitions. Browse these definitions or use the Search function for a specific definition.
Math Definitions
There are currently 3 definitions in this directory beginning with the letter Z.
Z-score
How many standard deviations a value is from the mean.
In this example, the value 1.7 is 2 standard deviations away from the mean of 1.4, so 1.7 has a z-score of 2.
Similarly 1.85 has a z-score of 3.
So to convert a value to a Standard Score ("z-score"):
· first subtract the mean,
· then divide by the standard deviation
In this example, the value 1.7 is 2 standard deviations away from the mean of 1.4, so 1.7 has a z-score of 2.
Similarly 1.85 has a z-score of 3.
So to convert a value to a Standard Score ("z-score"):
· first subtract the mean,
· then divide by the standard deviation
Zepto-
A prefix meaning one-sextillionth (1/1,000,000,000,000,000,000,000 or 10-21)
The same as multiplying by 10-21 (which is 0.000 000 000 000 000 000 001)
Prefix is z
Example: 12 zg = 12 zeptograms = 0.000 000 000 000 000 000 012 g
The mass of 1 single molecule of glucose (a simple sugar found in many foods) is 0.3 zg
The same as multiplying by 10-21 (which is 0.000 000 000 000 000 000 001)
Prefix is z
Example: 12 zg = 12 zeptograms = 0.000 000 000 000 000 000 012 g
The mass of 1 single molecule of glucose (a simple sugar found in many foods) is 0.3 zg
Zero
The whole number between −1 and 1, with the symbol 0
Shows that there is no amount.
Example: 6 − 6 = 0 (the difference between six and six is zero)
Zero is not positive and is also not negative.
When we add zero to a number the result is just the number, unchanged.
When we multiply a number by zero we get zero.
Zero is also used as a "place-holder" so that you can write a numeral properly.
Example: 502 (five hundred and two) could be mistaken for 52 (fifty two) without the zero in the tens place.
Shows that there is no amount.
Example: 6 − 6 = 0 (the difference between six and six is zero)
Zero is not positive and is also not negative.
When we add zero to a number the result is just the number, unchanged.
When we multiply a number by zero we get zero.
Zero is also used as a "place-holder" so that you can write a numeral properly.
Example: 502 (five hundred and two) could be mistaken for 52 (fifty two) without the zero in the tens place.
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