| right angle | like a square corner |
| parallel | lines that will never meet, no matter how long you stretch them (like railroad tracks!) |
| perpendicular | lines that cross in a right angle (or a + sign) |
| perimeter | the distance around the outside of a shape |
| area | the number of square units needed to cover a space |
| capacity | the amount a container can hold |
| centimeter | a metric unit of length smaller than an inch |
| certain | an event that will happen for sure |
| closed figure | a shape that has no open places |
| congruent | the same size and shape |
| difference | the answer to a subtraction problem |
| digit | a number |
| elapsed time | the amount of time that has passed |
| equivalent | equal |
| estimate | it tells you to use rounding |
| event | something that happens |
| expression | a math problem (like 12 +62, or 3 X 2) |
| foot | a measure of length equal to 12 inches |
| gallon | a measure of capacity equal to 4 quarts |
| gram | a very small measure of weight in the metric system |
| impossible | could never happen |
| inch | a small measure of length (there are 12 of them in a foot) |
| kilogram | a metric unit to measure weight (think of a large book |
| kilometer | a metric unit to measure distance (about half of a mile) |
| likely | it has a good chance of happening |
| mass | means the same as weight |
| median | the middle number (but the list has to be put in order first!) |
| meter | a metric unit to measure length or distance (it's about the same as a yard) |
| milliliter | a very small metric unit to measure capacity (what a dropper holds) |
| mode | the number that appears the most times |
| number sentence | a math problem, including the answer (like 24 + 36 = 60) |
| open figure | a shape that has an opening |
| ounce | a small unit of wieght (like one slice of bread) |
| pound | a unit of weight (it equals 16 ounces) |
| quadrilateral | a shape with 4 sides |
| quart | a unit to measure capacity (equals 2 pints) |
| range | to find this, you subtract the smallest number from the biggest |
| sum | the answer to an addition problem |
| symmetry | a shape can be folded along a line so that the two parts match exactly |
| tessellation | when a shape is repeated over and over to cover a surface with no spaces in between |
| yard | a unit for measuring length or distance (it is equal to 3 feet) |