- Aaron Daffern

# 5th Grade Math Review: Day 7

Updated: Apr 2, 2020

In __yesterday's post__ we looked at division, both with 2-digit divisors and with unit fractions. If you missed the live stream with the answers, you can watch that __here__. Today we're going to expand our knowledge of fractions by modeling adding and subtracting fractions and also start representing problem situations with an unknown, or variable.

**Modeling the Addition and Subtraction of Fractions**

In the fourth grade, students learned how to do this with fractions that had the same denominator. Now, fifth graders must learn how to first find a common denominator before adding or subtracting fractions.

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

**Representing Problems with an Unknown Quantity**

This is a skill that students worked hard to learn in 4th grade. There's not really any changes to this standard from 4th to 5th grade except that 5th graders are now being asked to solve, not just represent, problems with an unknown quantity represented by a letter.

With the information you reviewed in the video above, you're now ready to try these two problems.

**Correct Answers
**Tonight (4/1/20) at 8:00 pm (CDT), I'll live stream from my __YouTube channel__ to go over the answers to these three practice problems. Make sure you've already worked them out ahead of time. I can answer questions you might have in the stream chat and I'll put the recording on my channel and in this post for anyone that couldn't watch it live. If you haven't done so already, you can subscribe to the channel to get notifications for live streams and new videos that I post.

Here's the live stream with the answers and explanations.