| A | B |
| approximate | An estimate that is close to a solution but not exact. |
| Base-ten system | The number system in which numbers are written in decimal notation |
| Estimate | A number which is near another number; an approximation |
| Greater than | When comparing two numbers, the number with the higher value. |
| Less than | When comparing two numbers, the number with the lower value. |
| Mean | The sum of the data values in a data set divided by the number of data values. |
| Median | The middle value of an ordered set of data. |
| Mode | The number(s) that occurs most often in a data set. |
| Rounding | To make an estimate of a number by either changing to zeroes or dropping the digits to the right of the place value to which the estimate is made. |
| Whole Number | Any of the numbers 0, 1, 2, 3, …. |