Definition of an integer: an integer is another name for a whole number - either a positive or negative number, or zero
Things that aren't integers are things like: decimals, fractions, square roots mixed numbers and pie.
Rational and irrational numbers
Definition of a rational number: A rational number is a number that can be written as a fraction.
Rational numbers come in three different forms: integers, fractions and terminating or recurring decimals.
Definition of an irrational number: An irrational number is one that can not be written as a fraction.
Irrational things: never ending, non repeating decimals. Square roots of positive integers are either irrational or integers. pie is also irrational.
Squares and cubes
Definition of a square: a square is a number times by itself.
Definition of a cube: a cube is a number times by itself three times.
Definition of a prime number: A prime number is a number which doesn't divide by anything other than itself and 1.
1 is not a prime number.
What all prime numbers end in: Apart from 2 and 5 all prime numbers end in 1,3, 7 and 9.