# Question #f3fc1

##### 1 Answer

Sep 8, 2017

#### Answer:

2

#### Explanation:

Significant digits are numbers that have been actually measured.

In

If there were zeros to the right of the 51 those zeros would be significant. The zeros to the right would not change the value of the 51 digits so the only reason for writing zeros to the right of measured values is that the zeros have actually been measured.