## Rational Numbers: Definition & Examples

What are rational numbers Numbers are core of mathematics. Almost all of mathematics parts consist of numbers. There are some types of numbers. One of them is rational numbers. Rational numbers were invented by Greek mathematician, Phytagoras. Rational numbers consist of natural numbers and integers. Rational numbers symbolized as boldface Q (Q). It is type

## Fibonacci Sequence

About Fibonacci (The Man) His real name was Leonardo Pisano Bogollo. He lived in Italy between 1170 and 1250. “Fibonacci” was his nickname, which roughly means “Son of Bonacci”. Fibonacci was not the first to know about the sequence, it was known in India hundreds of years before! As well as being famous for the Fibonacci

## Even and Odd Numbers

Even Numbers Any integer that can be divided exactly by 2 is an even number. The last digit is 0, 2, 4, 6 or 8 Example: −10, -4, 0, 8, and 32 are all even numbers Odd Numbers Any integer that cannot be divided exactly by 2 is an odd number. The last digit is 1, 3,

## Cardinal and Ordinal Numbers Chart

Definitions A Cardinal Number is a number that says how many of something there are, such as 1, 2, 3, 4. An Ordinal Number is a number that tells the position of something in a list, such as 1st, 2nd, 3rd, 4th. Most ordinal numbers end in “th” except for: one ⇒ first (1st) two

## Absolute Value

Definition of Absolute Value Absolute value or modulus |x| of a real number x is the non-negative value of x without regard to its sign. |x| = x for a positive x, |x| = −x for a negative x (in which case −x is positive) |0| = 0. For example, the absolute value of 5 is

## Multiplication Tables

15 Times Table x 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 3 3 6 9

## Numbers

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

## Reciprocal of a Fraction

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

## Least Common Multiple

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

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