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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.

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