Face - The face refers to the shape that is bounded by the edges on a 3 dimensional object.
Factor - A number that will divide into another number exactly. (The factors of 10 are 1, 2 and 5).
Factoring - The process of breaking numbers down into all of their factors.
Factorial Notation - Often in combinatorics, you will be required to multiply consecutive numbers. The symbol used in factorial notation is ! When you see x!, the factorial of x is needed.
Factor Tree - A graphical representation showing the factors of a specific number.
Fibonacci Sequence - A sequence whereby each number is the sum of the two numbers preceding it.
Figure - Two dimensional shapes are often referred to as figures.
Finite - Not infinite. Finite has an end.
Flip - A refllection of a two dimensional shape, a mirror image of a shape.
Formula - A rule that describes the relationship of two or more variables. An equation stating the rule.
Fraction - A way of writing numbers that are not whole numbers. The fraction is written like 1/2.
Frequency - The number of times an event can happen in a specific period of times. Often used in probability.
Furlong - A unit of measurement - the side length of one square of an acre. One furlong is approximately 1/8 of a mile, 201.17 meters and 220 yards.