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# Gr 7 Math Chapter 2

### Holt Middle School Math Course 2 2004 - Chapter 2

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

power | repeated multiplication of a number(factor) by itself, such as 2x2x2x2 |

exponent | in a power, it is the number which represents how many times to use the base as a factor |

base | in a power, it is the number that gets multiplied by itself |

standard form | the way most numbers are written |

scientific notation | a shorthand way to write very large numbers |

numerical expression | an expression made up of numbers and operations |

order of operations | rules to be followed when simplifying a numerical expression |

prime number | a whole number greater than one that has exactly 2 factors, 1 and itself (example: 17) |

composite number | a whole number that has more than 2 factors (example: 6 has factors of 1, 2, 3, and 6) |

prime factorization | a composite number written as the product of its prime factors (example: 20 = 2 x 2 x 5) |

greatest common factor (GCF) | the greatest whole number that divides evenly into 2 or more whole numbers |

multiple | the product of a number and any whole number |

least common multiple | the least of the common multiples of two or more numbers |

variable | a letter that represents a number that can vary |

constant | a number that cannot change (example: 456) |

algebraic expression | an expression that contains one or more variables and often constants and operations |

evaluate an algebraic expression | substitute a number for the variable and simplify |

verbal expressions | words that can be translated into algebraic expressions |

term | a number, variable, or a product of numbers and variables (examples: 7 z 8y 12xy ) |

coefficient | a number that is multiplied by a variable in an algebraic expression (example: 8 in 8x) |

like terms | terms with the same variable raised to the same power (example: 7x and 10x ) |

equation | a mathematical statement that 2 expressions are equal in value (example: 7x+10=24) |

solution | the value of the variable that makes a statement(equation)true |

solve | to find the SOLUTION to an equation |

isolate the variable | get the variable ALONE on one side of the equation |

Addition Property of Equality | You can ADD the same amount to both sides of an equation and the statement will still be true |

inverse operations | operations which "undo" each other (example: addition and subtraction) |

Subtraction Property of Equality | You can SUBTRACT the same amount to both sides of an equation and the statement will still be true |

Multiplication Property of Equality | You can MULTIPLY both sides of an equation by the same amount and the statement will still be true |

Division Property of Equality | You can DIVIDE both sides of an equation by the same amount and the statement will still be true |

Created by:
alissa2222