#### What is Estimation?

Estimation refers to the calculation of a particular expression for the correct answer. In other words, we can say that it is the approximation of numbers and values. For example, according to the US statistics, 2.5 is the ideal number of children but it doesnâ€™t mean that people have a half child. Here, the estimation method work as the exact estimated statistic remains 2 to 3 children. Similarly, you can calculate the estimation of other things as well.
Majority the questions were in decimal form that are difficult to know the exact amount or value of something. Then, we people need to estimate the value with the help of rounding off techniques of mathematics. Mathematicians use the squiggly equal sign while finding out the estimating value. You will be greatly helpful while solving various math questions and finding out different exact values in real life.
**The General Rule of Estimation** - Round off techniques and general rules are crucial to solve the estimation method. You will see the right digit that you need to estimate. If that number is less than 5, you will round it down. If that value is greater than 5, you will calculate it up. These tricks belong to rounding off techniques for estimation process.

###### Estimate versus Actual Addition (Two 2-Digit Numbers)

Estimate the sum to the nearest tens. Calculate the actual sum of each answer to check your work.

###### Estimate versus Actual Subtraction 3-Digit Numbers

Get in the ballpark with these difference based problems.

###### Estimate versus Actual Addition Three 3-Digit Number Sums

Estimate the sum to the nearest hundreds. Calculate the actual sum of each answer to check your work.