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EnchantedLearning.com Math Dictionary

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F is for ...

factor The factor of a number is a number that divides that number exactly. For example, the factors of 6 are 1, 2, 3 and 6.

factor rainbow A factor rainbow is a rainbow-shaped diagram that factors of a number in pairs. In the example above, the factors of 24 are: 1*24, 2*12, 3*8, and 4*6. For a prime number (for example, 3 or 15), there will be only one pair of factors, one and the number itself. For a square number (for example, 9 or 16), there will be a single factor in the middle of the rainbow.

factor tree A factor tree is a graphical representation in tree form that shows the factors of a specific number.

! factorial In math, the exclamation point means factorial! The factorial of a number is equal to the number times all the positive whole numbers less than it. For example, 5!= 5x4x3x2x1=120.

Fahrenheit Fahrenheit is a measure of temperature that is abbreviated F. Water freezes at 32°F and boils at 212°F.

1, 1, 2, 3, 5, 8, 13... Fibonacci numbers The Fibonacci numbers are a sequence of numbers generated by adding the previous two numbers to get the next number, starting with two ones. Fibonacci numbers were named for the Italian mathematician Leonardo da Pisa, aka "Fibonacci" (c.1175-1250).

15 ***** ***** ***** fifteen Fifteen is the number after fourteen (14) and before sixteen (16). A fifteen-sided polygon is called a pentadecagon.

50 ********** ********** ********** ********** ********** fifty Fifty is the number after forty nine (49) and before fifty one (51). A fifty-sided figure is called a pentacontagon.

first The first person or thing comes before the others. First is abbreviated 1st.

five Five is the number between four and six. We have five fingers on each hand. A pentagon is a five-sided figure.

focus A focus (plural foci) is one of the central points of a conic section, such as an ellipse, hyperbola, or parabola.

(ax + b)( cx + d) FOIL FOIL is an acronym that stands for First, Outer, Inner, Last. It refers to a method of multiplying two binomials, like (ax + b)( cx + d). To multiply, you must multiply each term out, including the first terms (ax times cx), the inner terms (b times cx), the outer terms (ax times d), and the last terms (b times d). For example, (2x + 3)( 4x + 5) = 8x2 + 10x + 12x + 15 = 8x2 + 22x + 15.

foot A foot is a unit of measurement that is equal to twelve inches or one third of a yard.

F=ma formula A formula shows a mathematical relationship between expressions.

40 ********** ********** ********** ********** forty Forty is the number after thirty nine (39) and before forty one (41).

four Four is the number after three (3) and before five (5). A quadrilateral is a geometric figure that has four sides.

14 ******* ******* fourteen Fourteen is the number after thirteen (13) and before fifteen (15). A fourteen-sided polygon is called a tetradecagon.

fractal Fractals are patterns within patterns within patterns.

1/2 fraction A fraction is a part of a whole, like a half, a third, a quarter, etc. For example, half of an apple is a fraction of an apple. The top number in a fraction is called the numerator; the bottom number in a fraction is called the denominator.

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EnchantedLearning.com Math Dictionary

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Counting

Addition

Subtraction

Multiplication

Division

Number Line

Fractions

Decimals

Graphs

Measurement

Rounding

Click on an underlined word for more information on that subject. If the math term you are looking for is not in the dictionary, please e-mail us.

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