Category: 06. Rounding and estimating

Cluster estimation can be used to estimate sums and products when the numbers you are adding or multiplying cluster near or is close in value to a single number.Example # 1: Estimate 699 + 710 + 695 + 705 + 694 + 715 Carefully examine all the numbers above. You should notice that they all…

What are compatible numbers? Compatible numbers are numbers that look nice or friendly with each other when we do mental calculation to estimate a product, an addition, a subtraction, but especially a division. Using the figure above, we can make the following conclusions about compatible numbers: Estimating sums Estimating differences Estimating products and quotients. Some…

With front end estimation, we only round and add the numbers in the leftmost place or the very last number on the left.This means that all numbers in other places will be zeros except the number in the leftmost place after the numbers are rounded Having said that, if the numbers have two digits, round to the tens place before…

Rounding whole numbers is the process by which we make numbers look a little nicer. Numbers that look nice in our mind are numbers that usually end with a zero such as 10, 30, 200. Therefore, when rounding numbers, it usually means that you are going to try to put zero(s) at the end. Numbers…

This lesson about rounding and estimating will introduce you to some of the most common methods of estimation and rounding numbers. In many cases, some calculations may require an exact answer instead of an estimation. Pretend that you buy some groceries from the supermarket. You give the cashier 20 dollars for a purchase of 16.87 dollars. An exact…