| A | B |
| Compatiable Numbers | numbers that are close in value to the numbers you want to divide, and that are easy to divide mentally. |
| Formula | an equation that shows a relationship between quantities that are represented by variables. |
| Mean | the sum of the data items divided by the number of data items. |
| Measures of Central Tendency | the mean, median, and the mode. |
| Median | the middle number when there are an odd number of data items and they are written in order. For an even number of data items, it is the mean of the two middle numbers. |
| Metric System | a system of measurement that uses a decimal system to relate units to one another. |
| Mode | the data item that occurs the most often. |
| Perimeter | the distance around a geometric figure. |
| Outlier | a data value that is much higher or lower that the other data values in a collection of data. |
| Solution | any value or values that make an equation or an inequality true. |