| Term | Definition |
| expanded notation | writing a number to show it's place value, ex. (9x100) + (1x10) |
| acute angle | angle smaller than 90 degrees |
| place value | value of a digit based on it's position within a number |
| divisible | able to be divided by a whole number without a remainder |
| greatest common factor | largest common factor of 2 numbers |
| intersect | to share a common point |
| line | straight collection of points extending in opposite directions without end |
| angle | opening that is formed with 2 lines intersect |
| geometry | mathematics that deal with shapes, sizes and other properties of figures |
| parallel lines | lines on the same plane that do not intersect |
| ray | line that has a point on one end and goes forever on the other end |
| perpendicular lines | two lines that intersect at a right angle |
| oblique lines | lines that are neither horizontal or vertical |
| segment | a part of a line with two distinct endpoints |
| obtuse angle | an angle whose measure is between 90 and 180 degrees |
| skew lines | in a 3 dimensional space, line that do not intersect and are not in the same plane |
| plane | a flat surface with no boundaries |
| right angle | an angle that measures 90 degrees |
| straight angle | an angle that measures 180 degrees |
| vertex | a common end point |
| point | an exact position on a line, plane, or space |