Rounding - finding a number that is close to the original number by changing it to the closest multiple 10, 100, 100, etc , estimate  - a reasonable guess that is close to the correct answer , compatible number  - numbers that close to original value  and make it easier to solve mental and must end in a 0 or 5 , solution - an answer to a problem , place value - the value of a digit based on its position in a number  , sum - the total of two or more numbers added together, difference - the total of two or more when taken away or the distance they are apart from each other. ,

Estimation and Rounding

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