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# 4th Grade Math Review: Day 7

In yesterday's post we looked at long division and how to interpret remainders. We also looked at two-step multiplication and division problems. We're continuing today with estimation and representing an unknown quantity. We'll also take a quick look input-output tables.

Estimation and Compatible Numbers

Both estimation and the use of compatible numbers are skills that began in 3rd grade. Here's a video to remind you how it's done.

Now you can try it out yourself. Take a look at this sample problem from a released STAAR test below.

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Representing an Unknown Quantity

Students have been solving for unknown quantities in any position in the equation since 1st grade and representing them since 2nd grade. Here's a quick recap of that skill in action.

Now you can try.

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Input-Output Tables

Viewing relationships between numbers in a formal input-output table begins in the 4th grade and continues for many years to come. Here's an explanation of the process.

Now that you've learn a little bit more, try to solve this problem.

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