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# SJMS Math 7

### Math 7 SJMS Semester Study Guide

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

Prime Number | A whole number greater than 1 that has exactly 2 factors, 1 and itself. |

Prime factorization | Any whole number greater than one that has more than 2 factors. |

Exponent | In a power, the number of times the base number is used as a factor. |

Greatest common factor (GCF) | The greatest common factors of two or more numbers. |

Least common factor (LCF) | The least common of the non-zero common multiples of two or more numbers. |

Reciprocal | The multiplicitive inverse of a number |

Term | Variables, 2 or more terms in one expression that are separated by operations signs such as +, -, /, etc. |

x-coordinate | The first number of an ordered pair |

y-coordinate | The second number of an ordered pair. |

y-axis | Vertical number line in a coordinate plane |

x-axis | Horizontal number line in a coordinate plane |

Absolute value | The distance from zero on a number line. |

Additive inverse | The integer and its opposite. The sum of an integer and its oppostive is zero. |

Coefficient | The numerical part of an expression. |

Inequality | A mathematical sentence that contains the symbols < or >. |

Integer | The whole numbes and their opposites. For example... -3, -2, -1, 0, 1, 2, 3... |

Negative integer | Interger less than zero. |

Origin | The intersection of the x- and y-axis in a coordinate system.The zero point on a number line. |

Positive integer | Integer greater than zero |

Quadrant | One of the 4 regions into which the intersecting number lines divide the coordinate system. |

Multiplying integers | The product of two integers with different signs is negative. |

Subtracting integers | To subtract an integer, add its additive inverse. Ex. 6-3=6+(-3) |

Variable Expression | An expression that contains one or more variables. Ex. 6a, a+b, 6a+ab |

Variable | A letter or symbol used to represent one or more numbers. Any letter may be used. |

Evaluate | To evaluate a variable expression you must substitute a given number for the variable. Ex. |

Numerical expression | An expression that may contain one or more of the operations of addition, subtraction, multiplication or division, Ex. 3x5, 6+3, 8-9 |

Algerbraic expression | An expression that contains both numerical and variable expressions |

Real numbers | The set of numbers that contain all positive numbers, all negative numbers and zero. |

Natural numbers | The set of counting numbers, (1, 2,3) |

Whole numbers | (0, 1, 2, 3) |

Rational number | A number that can be written in the form m/n where m and n are integers and cannot equal zero. |

Twice as much as | 2x |

Two less than | x - 2 |

Five more than | x + 5 |

Three more than twice the unknown | 2x + 3 |

A number decreased by 7 | x - 7 |

Ten decreased by the unknown | 10 - x |

Sheri's age (x) 4 years from now | x + 4 |

Dan's age (x) 10 years ago | x - 10 |

Sum of a number and 20 | x + 20 |

Product of a number and 3 | 3x |

Quotient of a number and 8 | x/8 |

Three is four more than a number | 3= x + 4 |

Communative Property | States that two numbers may be added or multiplied in either order. |

Equation | Two or more mathematical expressions separated by equal signs |

Associative property | Allows you to add or multiply with different groupings. The final answer does not change |

Distributive property | The product of a number and sum or difference of numbers. |

Created by:
ecrumrin