DECIMAL a way of expressing a fraction in which numbers are divided by 10, 100, 1,000, and
other powers of ten Example: 2.567 is a decimal.
DIAGONAL in geometry, a line segment connecting opposite vertices of a shape DIAMETER
The distance of a line that connects two points on the edge of a circle, passing through the
center. It is the longest line in a circle and equal to twice the radius.
DIFFERENCE the result of subtraction Example: The difference between 2 and 5 is 3.
DIGIT an integer 0 through 9
DIRECT PROPORTION (DIRECT VARIATION) As one variable increases, so does the other.
Example: It takes Mark 5 hours to bake three-dozen donuts. It takes him 10 hours to
bake six-dozen donuts.DISTINCT different
Example: 2 and 3 are distinct numbers; 10 and 10 are not distinct.DIVISIBLE capable of being evenly divided by another number—that is, with no remainder
Example: 6 is divisible by 2.
EQUATION a mathematical statement in which one quantity equals another Example: x + 3 = y
− 2
EQUILATERAL a three-sided figure in which all three sides are equal. Each angle equals 60
degrees.
EVEN divisible by 2
Example: 2, 4, and 6 are even numbers.EXPONENT/POWER a number that indicates how many times to multiply a base by itself