A unit is a standard, agreed-on quantity by which other quantities are measured.
What is scientific notation and what are its components?
A method of writing large numbers more compactly. It consists of a decimal part (a number that is usually between 1 and 10), and an exponential part (10 raised to an exponent n)
What are the rules of a significant figure?
All nonzero digits are significant 1.05
Interior zeros (zeros between two numbers) are significant 4.0208
Trailing zeros (zeros after a decimal point) are significant 5.10
Leading zeros (zeros to the left of the first nonzero number) are not significant. They only server to locate the decimal place. 0.00005
Zeros at the end of a number but before a decimal point are ambiguous and should be avoided by using scientific notation