Rounding and estimatingThis lesson about rounding and estimating will show you some of the most common methods of estimation You give the cashier 20 dollars for a purchase of 16.87. An exact answer is important here so you get back the change that you deserve However, for other situations an estimate is sufficient unless you really want to be picky about it For example, suppose you lost a certain amount of pounds over the course of a year, you could be satisfied with an estimate 2.4, 2.5, 2.6, 2.3, 2.45, 2.60, 2.41, 2.35, 2.56, 2.49 Cluster estimation may help you see that you lost approximately 2.5 × 10 pounds or 25 pounds Rounding whole numbers Learning to round whole numbers is fundamental. This is where all your studies stat.Make sure you got a good understanding of this lesson before learning anything else. Take your time. We are not in a race here! Estimating a sum After you have mastered the lesson about rounding whole numbers, your next stop is right here. This lesson will show you how you can use rounding to the nearest ten, or hundred to get the best estimate when trying to estimate a sum. Front end estimation Next, front end estimation is explored, which can be used to estimate product and division. Unlike estimating a sum, which may try to estimate by rounding to different places, front end estimation only roud and add the numbers in the leftmost place. You must explore this type of estimating numbers! Compatible numbers Finally, compatible will take estimation to a whole new level.If you have no clue what compatible numbers are, this is the time to learn what they are and how they are used to get good estimate for multiplication and division. Cluster estimation Learn how to use cluster estimation to estimate sums and products.
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