Accurately known digits along with first doubtful digit are called significant figures.
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There are two types of significant figures, measured and exact. Numbers are often rounded to avoid reporting insignificant figures. Numbers can also be rounded merely for simplicity rather than to indicate a given precision of measurement.
There are 5 significant figures in 70700 as the zeros are between and after the numbers.
There are 5 significant figures.
5 significant figures.
4 significant figures.