Question

How do you round 100.1°C to 1 significant figure?

Answer 1

`100` has one significant figure.

Explanation:

As the number is given, it has 4 significant figures.

The zero's are part of the number, they are not just place holders making the number 10 times bigger or smaller.

`100.1` has 4 significant figures in the same way that `135.1`would.

`100` has 1 significant figure

In this case, 2 and 3 significant figures would also be 100