Accurate, Precise and Significant Digits

Accuracy is how close a measured value is to the actual value.
Precision is how close the measured values are to each other.

Significant Digits rule: Atlantic Vs.Pacific
Atlantic- if decimal is Absent, count  all numbers from the right (Atlantic) with the first nonzero to the left
Pacific- if decimal is Present, count all numbers from the left (Pacific) side with the first nonzero to the right