Scientific Understanding

**How do we treat ZEROs to the LEFT of NON-ZERO numbers in significant figures?**

Since we read from right to left in many languages (including English) usually the first set of ZEROs you come upon are ZEROs to the left of NON-ZERO numbers. ZEROS to the LEFT of NON-ZERO numbers are NEVER significant. This means we DO NOT count them.

**Examples**: Determine the number of significant figures. **VIDEO demonstration of the significant figures part 1** from the examples below.

Measured Number | Number of Significant Figures |

0045 | 2 |

0.0031 | 2 |

000284 | 3 |

0.0000079623 | 5 |

**PRACTICE PROBLEMS**: Determine the number of significant figures.

Measured Number | Number of Significant Figures |

0.7521 | 4 |

00039 | 2 |

0582 | 3 |

0.006488 | 4 |

0.0245976 | 6 |