**Parallel Lines:** Two lines in the same plane that never
intersect.

**Parallelogram:** A quadrilateral where both pairs of opposite
sides are parallel.

**Parentheses:** Enclosures for quantities to be grouped
together.

**Percent:** The number of parts per hundred.

**Percentage:** The result obtained by taking a given percent of
the base.

**Percent of Change:** The ratio of the amount of change to the original amount expressed as a percent.

**Percent of Decrease:** The percent of change found when the
original amount decreases.

**Percent of Increase: **The percent of change found when the original amount increases.

**Perfect Square:** A whole number with integer square roots.

**Perimeter:** The perimeter of a figure is the distance around
the figure.

**Perpendicular Lines:** Lines that inter sect to form right
angles.

**Pi:** The ratio
expressed by dividing the circumference of any circle by its diameter.

**Place value: **The value of the symbol, according to its place in the numeral.

**Point:** The position of the intersection of two lines. It
does not have length, width, or thickness.

**Polygon:** A plane geometric figure bounded by three or more
line segments that join without crossing one another.

**Polynomial:** An algebraic expression with one or more
variables.

**Positive Number:** Number greater than zero.

**Power: **A power of a
number is the product obtained by multiplying the number by itself a given
number of times.

**Product:** The result of the multiplication of the
multiplicand and the multiplier.

**Prime Factorization:** A number written as a product of prime
factors.

**Prime Number:** A natural number bigger than one whose only
divisors are I and itself.

**Probability: **How likely it is that an event will occur.

**Proper Fraction:** A fraction with a value less than one.

**Prime Factorization:** The prime factorization of a number is
the expression of the number as the product of its prime factor.

**Pythagorean Theorem:**
In any right triangle, the sum of the squares of the lengths of the legs
is equal to the square of the length of the hypotenuse.