A number is a mathematical object used to measure, count, & label. In common usage, number may refer to mathematical object, a word or phrase, or a symbol. The notion of number has been extended over the centuries to include 0, negative numbers, rational numbers such as 2/5 and −1/3, real numbers such as √2
Fractions A Fraction (such as 2/3) has two numbers: Numerator: the top number Denominator: the bottom number We call the top number the Numerator, it is the number of parts we have. We call the bottom number the Denominator, it is the number of parts the whole is divided into. Reciprocal of a Fraction To
Common Multiple A common Multiple number is a multiple of two or more numbers. Example Multiple of 3 and 4: Number Multiples 3 3, 6, 9, 12, 15, 18, 21, 24, … 4 4, 8, 12, 16, 20, 24, … So, the common multiples of 3 and 4 are: 12, 24, … Least Common Multiple
Greatest Common Factor (GCF) or Highest Common Factor (HCF) is the largest of the common factors. Greatest Common Factor is useful to simplify a fraction, because it is the largest number we can divide both numerator and denominator of a fraction. How to Find the Greatest Common Factor Method 1 find all factors of both
Imaginary number Imaginary number (when squared give a negative result) i is the unit of imaginary number which is square root of -1 i = √-1, because i2=-1 So, (7i)2 = -7 Definition of Complex Number A Complex Number is a combination of a Real Number and an Imaginary Number Either Part Can Be Zero
Definitions Factors are numbers we multiply together to get another number. When we find the factors of two or more numbers, and then find some factors are the same (common), they are the common factors. Factors of two (or more) numbers have in common are called the common factors of those numbers. Example Learn More Greatest Common
The factorial function (using symbol: !) says to multiply all whole numbers from our chosen number down to 1. So n! (read “n factorial”) means n × (n-1) × (n-2) × … × 3 × 2 × 1 Definition of Factorial What is the Factorial function? The factorial function is a function represented by an exclamation mark
Table of Factors Table of Factors for 1 to 100 (not including negatives) Number Factors 1 1 2 1, 2 3 1, 3 4 1, 2, 4 5 1, 5 6 1, 2, 3, 6 7 1, 7 8 1, 2, 4, 8 9 1, 3, 9 10 1, 2, 5, 10 11 1, 11
Prime Numbers A Prime Number is a whole number greater than 1 that can not be made by multiplying other whole numbers. The number that we can make by multiplying other whole numbers is a Composite Number. Factors Factors are the numbers you multiply together to get another number 4 × 2 = 8 From
The reciprocal of a number is one divided by that number Reciprocal of a Fraction To get the reciprocal of a fraction, simply switch the top and bottom of the fraction (numerator and denominator). Reciprocal of a Reciprocal The reciprocal of a reciprocal takes you back to where we started: Remember that “Reciprocal” comes from the Latin reciprocus