## Wednesday, January 20, 2010

### Mathematical Dictionary

Hi
I have attached a mathematical dictionary for your use and reference.
Quiz time:
Find the definitions of the following terms with examples (first one to post and got them correct stand to win a mathematical prize)
1. Prime number
2. Natural number
3. Rational Number
4. Vulgar Fraction
5. Indices

1. prime number:
A positive integer which has only 1 and the number itself as factors. For example, 2, 3, 5, 7, 11, 13, etc. are all primes. By convention, the number 1 is not prime.
Natural number:The numbers used for counting.
Rational number:All positive and negative fractions, including integers and so-called improper fractions. Formally, rational numbers are the set of all real numbers that can be written as a ratio of integers with nonzero denominator. Rational numbers are indicated by the symbol .
Vulgar Fraction:It's what most of us simply call a fraction, i.e. one written with the numerator and denominator separated by a line
Indicesa number is multiplied by itself any number of times, the expression is simplified by using the index notation.

2. well done Kristin - now waiting for the other inputs before I decide on the rightful winner.

3. A prime number is a positive number that is more than 1 which can only divisible by only one number and its only factor,1.
A natural number is any positive number that is at least 1 or more.
A rational number is all positive and negative fractions, including integers and so-called improper fractions. Formally, rational numbers are the set of all real numbers that can be written as a ratio of integers with nonzero denominator.
A vulgar fraction is a another way to call our common fractions.So,actually vulgar fractions means our normal fraction which has a numerator and a denominator.A fraction means a ratio of numbers or variables.
A indices number is a mathematical expression that makes a number multiply by the number of times what the mathematical expression had stated.The expression is being read as to the power of.However,we cannot easily work out what 2³×5² is, whereas we can simplify 3²×3³ .

4. Sources are from wikipedia and mathsrevision.net

5. 1)Prime numbers: Numbers that can be divided by itself or 1. E.g. 2,3,5,7,11,13,17
2)natural number: natural numbers are regular numbers you count with.
3)Rational number: rational numbers are non zero numbers that can be written as a ratio
4)vulgar fractions is a we usually call fraction a numerator on top and denominator below.
5)Indices:They are square number, cube numbers and so on. Numbers they are multiplied by themselves 2 or more times.

Source: Mathsrevision.net

6. Prime number:A number that only has 1 and itself as factors.
Natural number:The numbers that are used for counting.
Rational number:A number that makes sense,a positive number.
Vulgar fraction:A common fraction. E.g 2/7
Indices:The number of times by which a number is multiplied by itself.

7. Prime number: A number that can be divided by itself and 1.
Natural number: Numbers used for counting.(1 orange, 2 oranges, 3 oranges)
Rational number: A number expressible
Vulgar fraction: A common fraction (eg 5/9)
Indices: This allows us to represent numbers in standard form.

8. What is:
1. Prime number
- It is a number that can only be divided by 1 and itself.
-eg. 2, 3,5,7 etc.
2. Natural numbers
-They are numbers used for counting
-eg. 1,2,3...
3. Rational numbers
-They are a set of numbers of real numbers that can be written as a ratio of integers with non-zero denominator.
4. Vulgar number
-It is a common fraction
-eg. 1/5
5. Indices
-They are used to represent numbers in a standard form.
-The little 2 or 3 on the top right of numbers are indices.

Source: Mathsrevision.net
Wikipedia

9. Prime number- is a number which can only be divide by he number 1 or itself, it cannot be divided by any other numbers. e.g. 2,3,5,7,etc...

Natural numbers- are numbers that can be used for counting and is not negative. e.g. 1,2,3,4,5,etc...

Rational numbers_ are numbers with a denominator that is not zero but it is at least 1 and can be converted to either fraction or ratio. e.g. -4,5/9,6,etc...

Vulgar fraction- is a fraction which is common and is different from decimal fractions. e.g. 2/3,5/46,etc.....

Indices- are numbers that shows the times a number has multiplied itself.(also known as powers) e.g. 2 to the power of 5, 6 square, 9 cube, etc.....

10. Prime numbers are numbers that can only be able to divide by 1 and itself.

Natural numbers are numbers used for counting

Rational numbers are numbers that can be expressed exacly by a ratio of two integers

Vulgar fraction is a fraction which is common and us different from decimal fractions

Indices are numbers are little numbers on top of another number which represents (the power of)

11. Prime Numbers:
A positive integer which has only 1 and the number itself as factors. Ex. 2, 3, 5, 7, 11, 13, etc.
Natural Numbers:
The numbers used for counting. Ex. 1, 2, 3, 4, etc.
Rational Number:the set of all real numbers that can be written as a ratio of integers with nonzero denominator.
Vulgar Fractions:
A rational number written as a numerator divided by a denominator.
Indices:
a number or symbol or expression associated with another to indicate a mathematical operation to be performed.
Sources: merriam-webster's online dictionary, wikipedia,www.mathwords.com
Jing Heng