| A | B |
| error | a mistake |
| line of symmetry | divides a figure into identical pieces |
| digit | a number |
| fraction | a part of a whole |
| polygon | a plane figure having three or more straight sides |
| place value | the position of a digit in a number |
| estimate | to get an approximate answer |
| pentagon | a polygon with 5 sides |
| pictograph | a graph using pictures to show information |
| thermometer | an instrument used to measure temperature |