| Term | Definition |
| Round Number | a whole number that ends with one or more zeroes |
| Elapsed Time | the difference between a starting time and an ending time |
| Acute Triangle | a triangle whose largest angle measures less than 90 degrees |
| Equilateral Triangle | a triangle in which all sides are thee same length |
| Isosceles Triangle | a tringle with at least two sides of equal length |
| Obtuse Angle | an angle whose measure is more than 90 degrees and less than 180 degrees |
| Right Triangle | a tringle whose largest angle measures 90 degrees |
| Scalene Tringle | a triangle with three sides of different lengths |
| Mixed Number | a whole number and a friction together |