# Physics Grade 11 - Significant Digits

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2017-09-06 20:38

## Section 1

Question | Answer |
---|---|

Significant Digit | Number which represents the accuracy/precision of a tool. |

How many rules for significant digits? | 6 |

Rule 1 | All non-zero digits are significant |

Rule 2 | Any zero between two non-zero digits are significant |

Rule 3 | Any zeros to the right of a decimal & after non-zero are significant |

Rule 4 | Any zeros to the left of first non-zero are ignored |

Rule 5 | In scientific notation, only digits in coefficient are counted |

Rule 6 | All zeros in counted or defined values are significant |

## Math

Question | Answer |
---|---|

Adding and Subtracting | Answer should be expressed using measurement with least number of decimal places |

Multiply and Divide | Answer should be expressed using measurement with least number of significant digits. |

Rounding Down | When digit dropped is less than 5 * 10^[1-inf] the remaining digit is left unchanged |

Rounding Up | When digit dropped is greater than 5 * 10^[n - inf] the remaining digit is increased |

Rounding with 5 * 10^[n - inf] | When digit dropped is equal to 5 * 10^[] |

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