when is the estimation of product is a useful tool
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Front end estimation- An estimation method in which the front digits are added or subtracted
Collateral Damage Estimation (CDE)
front end estimation means to use only the whole number part of the decimal. we only use whole numbers to do front end estimation
It is difficult to answer the question because, for addition or subtraction, it is often easier to obtain the exact answer! If you line up the decimal points and then follow the rules of addition or subtraction - exactly as they would apply to whole numbers - you will get the correct answer!Estimation may be useful to check your answer if you are poor at addition or subtraction of integers. But, if that is the case, your estimate is equally likely to be wrong!
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