| A | B |
|---|
| Digit | One of the number symbols 0,1,2,3,4,5,6,7,8,9 in the standard base-10 system |
| Place Value | The value that is given to a digit according to its position in a number |
| Standard Form | The most familiar way of representing numbers, using base-10 place value system |
| Expanded Form | Sum of the values of each digit: 365 = 300 + 60 + 5 |
| Approximate | Close to exact |
| Rounding | To change a numbers slightly to make it easier to work with, usually ending in zeroes |
| Millions | The next numbered grouping after thousands; the numbers from a million to a billion |
| Close-to Estimation | Estimation that uses close-but-easier numbers |
| Estimate | An answer close to an exact answer |
| Front End Estimation | An estimation method that keeps only the left-most digit in the numbers and puts 0s in for all others |
| Number Model | Group of numbers and symbols that fits a number story or situation 5 + 8 = 13 |
| Unknown Quantity | A quantity whose value is not known, shown as a "________", letter or ? |
| Partial Sums Addition | To add in which sums are computed for each place (ones, tens, hundreds…), then add the partial sums |
| US Traditional Addition | Addition method that involves adding digits by place value columns starting at the right |
