## Key Terms

Before we get any further into this topic, let's review a few 'must-know' key terms:

**is just a educated 'math guess' we make in order to change numbers so they are easier for us to calculate.**

__Estimating__**is just the answer to an addition problem.**

__Sum____is just the answer to a subtraction problem__

**Difference****is just to combine our title!**

*And*
'Estimating Sums

**Differences'**__and__## Estimate!

Now that we know our key terms, let's get started!

Let's say we have a problem such as the following:

7,786

+6,629

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We have to estimate the numbers to the nearest hundreds place and then add to get our estimated sum.

7,786=7,800

6,629=6,600

The sum of our estimated numbers 7,800+6,600 equals 14,400.

That means...

The estimated sum, to the nearest hundred, for 7,786+6,629=14,400!

*Sheet 1 How to Estimate the Sums and Differences*

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