| | area | plane surface, as of the floor of a room; open space in a building; the enclosed space; extent; scope; range | 
| bar graph | a chart with bars whose lengths are proportional to quantities | 
| decimal | numbered or proceeding by tens; based on ten; a proper fraction whose denominator is a power of 10 | 
| denominator | the divisor of a fraction | 
| distributive property | a special way in which multiplication is applied to addition of two or more numbers in which each term inside a set of parentheses can be multiplied by a factor outside the parentheses | 
| fifths | one of five equal parts of a whole | 
| hundredths | one of a hundred equal parts of a whole; called also percent | 
| line graph | a graph in which a series of connected straight lines connect points, each of which represents the value of a particular variable | 
| median | the value below which 50% of the cases fall | 
| mode | prevailing style; manner; way of doing something; fashion or style | 
| numerator | the dividend of a fraction | 
| parallel | make or place something to another's side; of or relating to multiple operations at same time; not intersecting | 
| perimeter | outer boundary length; closed curve bounding a plane area | 
| perpendicular | vertical; upright; intersecting at or forming right angles; extremely steep | 
| proportion | percentage; quotient obtained when a part is divided by the whole; part considered in relation to the whole | 
| quadrant | a quarter of the circumference of a circle; any of the four areas into which a plane is divided by two orthogonal coordinate axes | 
| range | limits within which something can be effective; variety of different things or activities | 
| rational number | an integer or a fraction | 
| reflection | image of something as reflected by mirror; remark expressing careful consideration | 
| rotation | revolution; act of rotating as if on an axis | 
| tenths | one of ten equal parts of a whole | 
| transformation | change in form , appearance, nature, disposition, condition, or the like | 
| translation | transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same | 
| twelfths | one of twelve equal parts of a whole | 
 |