In math, thousandth means 1/1000 or 0.001. For example to write out 5.003 you would write: 5 and 3 thousandths. Another example is one thousandth of 5000 is 5000 x 1/1000 which is 5.
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milligram
Milli = a thousandth.
What does length mean in math
one thousand or one thousandth
I think you mean "milliseconds". The prefix "milli" is used in the metric system of measurements to mean "one thousandth of", so a "millisecond" is one thousandth of a second, which means that there must be 1000 of them in 1 second.