The ODD numbers are 1,3,5,7,9,,13,15 and so on.

The EVEN numbers are 2,4,6,8,10,,14 and so on.

You can NOT divide the odd numbers by 2.

You can divide the even numbers by .

Examples of CONSECUTIVE numbers: 1,2 or 5,6 or 10, or 34,35.

The NATURAL NUMBERS are 0,1,2,3,4,5,,7,8,9 and so on.

INTEGERS are positive or negative numbers: -4, -3, -2, -1, 0, 1, , 3, 4 for example.

Find the DIFFERENCE means 'take-away' or 'subtract' or ''.

The difference between 4 and 6 is 2.

The between 10 and 15 is 5.

The difference between 8 and 2 is .

The SUM of 2 numbers means ADD.

The sum of 2 and 3 is 5.

The sum of 10 and 15 is .

To find the PRODUCT you MULTIPLY.

The product of 2 and 3 is 6.

The product of 10 and 10 is .

The of 4 and 4 is 16.

The factors of 12 are: 1x12, 2x6, 3x.

The factors of 8 are: 1x8, x4.

The factors of 9 are: 1x9, x3.

The of 20 are: 1x20, 2x10, 4x5.

Prime numbers have only 2 :

Some prime numbers are: 2, 3, 5, , 11, 13, 17, 19, 23.....

Multiples of 12 = 12, 24, 48, , 72, 84...

Multiples of 2 = 2, 4, , 8, 10.....

of 3 are 3, 6, 9, 12, 15, 18....