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# Chapter 1 - Math

### Place Value, Adding, and Subtracting

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

Associative Property of Addition | Addends can be regrouped and the sum remains the same. Example: (a+b)+c = a+(b+c) |

Addends | any number used to get the sum or the total. |

Commutative Property of Addition | The order of the addends can be changed and the sum remains the same. Example: a+b+c=b+c+a |

Compatible numbers | Numbers which are easy to compute with mentally. |

Compensation | Adjusting one number of an operations to make computations easier and balancing the adjustment by changing the other number |

Digits | The symbols used to show numbers: 0, 1, 2, 3, 4, 5, 6, 8, 8, and 9. |

Expanded form | A way to write a number that shows the palce value of each digit. Example: 3,000+500+60+2 |

Equivalent decimals | Decimals which name the same amount. Example 0.7=0.70 |

Front-end estimation | A method of estimating by changing numbers to the place value of their front digit and then finding the sum or difference. |

Rounding | A process that tells which multiple of 10, 100, 1,000, etc. a number is closest to. |

Sum | The number that is the result of adding two or more addends. |

Standard form | A number written with commas separating groups of three digits starting from the right. Example 3,456,789 |

Place value | The position of a digit in a number that is used to determine the value of the digit. Example: In 5,318, 3 is in the hundreds place. So the 3 has a value of 300. |

Period | A group of 3 digits in a number. Periods are separated by a comma and start from the right of a number. |

Tenth | One out of ten equal parts of a whole. |

Thousandths | One out of thousand (1,000) equal parts of a whole. |

Word form | A number written in words using place value. |

Hundredth | One part of 100 equal parts of a whole. |

Difference | The number that results from subtracting one number from another. |

Created by:
Ms. Smiley