An approximation of a number, based on reasonable assumptions.

a number made up of a whole number and a fraction

Mean

Add all the scores and divide by the number of scores

a whole # that only has two factors; itself and 1

The largest factor that two or more numbers have in common.

numbers used in estimation

...-3,-2,-1,0,1,2,3..., All whole numbers (both positive and negative) and zero.

Can be divided by a number without leaving a remainder

The distance around a figure

move numbers around and they mean the same thing *THINK COMMUTE = move

In mult or add, the order of two numbers may be switched around and the answer is the same. Ex: a+b = b+a.

Grouping numbers together *THINK associates means group

Changing the grouping of numbers will NOT change the value. For example: (7 + 4) + 8 = 7 + (4 + 8) also works with multiplication