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Math: Numbers




 
Related Topics:
More Lessons for Grade 6, Math Worksheets

We all work with numbers every day, often without really thinking about them: numbers on the newspaper (prices, dates,amounts); numbers on the television or radio; sporting results; time; labels on food; money; addresses, bar codes and many more.

Natural numbers

  • Natural numbers are positive integers. E.g. 1, 2, 3, …

Whole numbers

  • Some authors take whole numbers to be 0, 1, 2, 3, …
  • Other authors may consider whole numbers as
  • ... –4, –3, –2, –1, 0, 1, 2, 3, 4, ...

    which makes whole numbers the same as integers.

Rational numbers

  • Rational numbers are numbers that can be written as a fraction where the numerator and denominator are integers.


Irrational numbers

  • Irrational numbers are numbers that are not rational. In other words, they are numbers that cannot be written as fractions.
  • In decimal form, these numbers go on forever and the same pattern of digits are not repeated.
  • For example:. pi(π) = 3.142.. and = 1.4142….

Real numbers

  • Real numbers are all the rational and irrational numbers.

The following diagram shows the relationship between the types of numbers:




Classifying Real Numbers
This video explains the different classifications of Real Numbers and has a number of examples.
The following video will describe what are natural numbers, integers, rational numbers and more.


 

Squares

  • The square of a number is the number multiplied by itself.
  • For e.g. square of 4 = 4 2 = (4 × 4) = 16
  • Perfect squares are squares of whole numbers.
  • Some examples of perfect squares are 12 = 1, 22 = 4, 32 = 9, 42 = 16, 52 = 25, 62 = 36

Square roots

  • The square root of a number n is the number that gives n when multiplied by itself.
  • For e.g. square root of 49 = 7 because (7 × 7) = 49
  • The square root of a perfect square would be a whole number.

Cubes

  • The cube of a number is the number multiplied by itself twice
  • For e.g. cube of 4 = 4 3 = (4 × 4 × 4) = 64
  • Perfect cubes are cubes of whole numbers.
  • Some examples of cubes are 13 = 1, 23 = 8, 33 = 27, 43 = 64, 53 = 125, 63 = 216

Cube roots

  • The cube root of a number n is the number that gives n when multiplied by itself twice.
  • For e.g. cube root of 27 = 3 because (3 × 3 × 3) = 27
  • The cube root of a perfect cube would be a whole number.


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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