| Term | Definition |
|
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) |