click below

click below

Normal Size Small Size show me how

# Number & Operations

### Vocabulary

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

whole number | the basic counting numbers 0, 1, 2, 3, 4, 5, 6, … and so on |

rounding | To replace a number with a number that tells about how much or how many to the nearest ten, hundred, thousand, and so on. Example: 42 rounded to the nearest 10 is 40. |

estimation | to find a number that is close to the exact answer. |

regroup - (regrouping) | to name a whole number in a different way. Example: 28 = 1 ten 18 ones |

number line | A line that shows numbers in order using a scale. |

place value | The value given to the place a digit has in a number. Example: In 946, the place value of the digit 9 is hundreds. |

addend | Numbers added together to give a sum. |

subtraction - | to take away from a group or a number of things. When we subtract, the number of things in the group reduce or become less. |

addition | Finding the total, or sum, by combining two or more numbers. |

plus | A symbol that shows addition; combine; put together two or more quantities. |

sum | The answer to an addition problem. |

digit | The symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 used to write numbers. |

difference | The answer when subtracting one number from another. |

identity property of addition | says that the sum of 0 and any number is that number. Here's an example: 0 + 4 = 4 0 + 4 = 4 0+4=4. |

commutative property of addition | says that changing the order of addends does not change the sum. |

associative property of addition | Changing the grouping of addends does not change the sum. For example, (2 + 3) + 4 = 2 + (3 + 4)(2+3)+4=2+(3+4)left parenthesis, 2, plus, 3, right parenthesis, plus, 4, equals, 2, plus, left parenthesis, 3, plus, 4, right parenthesis. |

bar graph | A graph drawn using rectangular bars to show how large each value is. |

line plot | a graph that displays data as points or check marks above a number line, showing the frequency of each value. |