1 
significant figureA convention for recording measurements. Measurements are rounded so that they contain only the digits up to and including the first uncertain digit, when the number is written in scientific notation.

2 
significant figureEvery digit that is known in a measurement (Lesson 3)

3 
significant figureThe number of accurate numbers in a measurement. If the distance between two points is measured to the nearest hundredth and recorded as 238.41 feet (or meters), the measurement has five significant f [..]

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