Two.
80 has 1 significant figure.
.80 there are 2 significant figures
One.
Integers ending in 0 are ambiguous since it is not possible to distinguish between a number accurate to the nearest unit and one rounded to the nearest 10. It has 1 significant figure, but could have 2 sf.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 2 significant figures in this number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The number 80 is an even number and is the sum of the first nine prime numbers. It is also the product of 2^4 and 5, making it a composite number. In Roman numerals, 80 is represented as LXXX. Additionally, 80 is significant in various contexts, such as being the age at which some people celebrate milestone birthdays.
3 significant figures.