| A | B |
|---|
| mean | sum of data divided by the number of pieces of data |
| median | middle number in a set of data when the data is in numerical order |
| mode | item that appears most often in a set of data |
| order of operations | set of rules to follow when calculating numbers |
| Do all operations in parentheses | First step in order of operations |
| Multiply and divide in order from left to right | 2nd step in order of operations |
| Add and subtract in order from left to right | 3rd step in order of operations |
| magic square | special arrangement of numbers in a square |
| rows, columns, and diagonals have same sum | magic square |
| variable | a symbol, usually a letter that stands for an unknown number |
| numerical expression | contains only numbers and operation symbols |
| 8 + 5 + 2 | numerical expression |
| variable expression | contains at least one variable |
| a + 7 + 2 | variable expression |
| equation | mathematical sentence that contains an equal sign |
| = | is equal to |
| 1 + 1 = 2 | equation |
| solve | replace variable with a number that makes the equation true |
| solution | the number that makes the equation true |
