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Math chapter 1 vocabulary
estimate  a number close to an exact number.
expanded form  way to write numbers by showing the value of each digit. round  to replace a number with another number that tells about how much or how many word form  a way to write numbers by using words. order  a particular arrangement or placement of things one after the other. 
period  each group of three digits separated by commas in a multidigit number.
standard form  a way to write numbers by using the digits 09 with each digit having a place value. compare  to describe whether numbers are equal to, less than, or greater than each other place value  the value of a digit in a number, based on the location of the digit. 
Here are two great music videos to help you remember the rules for rounding.


Check out this video on estimating sums and differences.

