Bar Graphs

In the last lesson, we met Ruben:

Ruben was cleaning his room when he found a bag of marbles. He wantedto keep a recordof the number of marbles he had in each color.

You already helped Ruben make and read tally charts.

Can you think of other ways Ruben can keep track of the number of marbles he has in each color?

That's right!

He can also use a **bar graph**!Β

A **bar graph **is a graph drawn using rectangular bars to show how large each item or group is.

**Bar graph** can be drawn either horizontally or vertically.

**Bar graph** is a good way to show and compare relative sizes.

Before making a bar graph, let's use a **tally chart** one more time to help count how many marbles Ruben has in each color.

π Draw a three-column table. Label the **first column **with the name of the object or **category **you want to count.

The **second column** will be for the **tally marks**.

The **third column** will be for the **total tally count**. π

π Then, **count **the number of marbles for each color.

Keep track of the count using **tally marks**. π

Let's make a tally chart for Ruben's marbles!

Now that we've counted the marbles in each color, how do you use the information to make a **bar graph**?

π First, draw a **horizontal axis **and a **vertical axis.** In other words, draw a vertical line and a horizontal line.

Label the **horizontal axis** with the **category name (Marble Color)** and the **vertical axis** with the **total count**.

**π€ Tip:** Be sure that the **highest number on the vertical axis** matches the **highest count **of marbles. In our example, the highest number is 10, because it's the total number of marbles for the biggest group of marbles.

Also, make sure to you give your bar graph a **title**!Β

We used Ruben's Marbles, because we're counting all the marbles that were in the bag that Ruben found.

π Next, draw **rectangular bars **to represent the value for each category.

π€ To know how tall each rectangular bar should be, look at the tally chart.

β
Ruben has **8 blue marbles**. This means the height of the bar for "**Blue**" is **8**.

β
Ruben has **6 green marbles**. This means the height of the bar for "**Green**" is **6**.

β
Ruben has **10 red marbles**. This means the height of the bar for "**Red**" is **10**.

β
Ruben has **5 yellow marbles**. This means the height of the bar for "**Yellow**" is **5**.

And that's it!

You've described Ruben's marbles using a **bar graph**!

π€ If you look at the bar graph, you can see that "**Red"** is the **tallest **and "**Yellow"** is the **shortest.**

π This means that Red has the **most **number of marbles and Yellow has the **least **number.

π We can quickly see that there are **8 blue marbles **and **6 green marbles.**

To **read the bar graph**, we just looked at the names and the topmost part of the bars. The number that matches the top of a bar tells us the information that we need to know.

Wasn't it easy to read the bar graph? π

You can also create your own bar graph later! π

For now, it's time to practice what you've learned! πͺ

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