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# Unit 2 CCMath Vocab

### Adding and Subtracting Whole Numbers

Term | Definition |
---|---|

Addition | total amount of objects together in a collection |

Addends | The numbers that are added together to find a sum. |

Sum | The result of adding numbers together. |

Subtraction | The process or skill of taking one number or amount away from another. |

Difference | The answer when subtracting two numbers. |

Mental Math | The process of completing math problems in your head. |

Breaking apart | Mental math method used to rewrite a number as the sum of numbers to form an easier problem. |

Counting on | Counting up from the smaller number to find the difference of two numbers. |

Compensation | Choosing numbers close to the numbers in a problem, and then adjusting the answer to compensate for the numbers chosen. |

Commutative Property of Addition | Numbers can be added in any order and the sum remains the same. |

Associative Property of Addition | Addends can be regrouped and the sum remains the same. |

Inverse Operations | Two operations that undo each other. Addition and subtraction are inverse operations. |

Estimate | To make an approximate or rough calculation, often based on rounding. |

Identity Property of Addition | Any number added to zero (0) will give that number as the sum. |

Reasonable | An answer that makes sense and can be proven. |

Unreasonable | An answer that does NOT make sense and can't be proven. |

Regrouping | Rearranging the formation of a group. For example: a group of 10 ones can be formed into 1 ten. |

Whole Number | Any number between 0 and infinity that DOES NOT contain a fraction or a decimal. |

Created by:
ESASDgrade4