Lesson 3. Draw and label a bar graph to represent data; relate the count scale to the number line.

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Presentation transcript:

Lesson 3

Draw and label a bar graph to represent data; relate the count scale to the number line.

Sprint A On your mark, get set, THINK! Sprint B On your mark, get set, THINK!

Name my coin. How much is it worth? Listen carefully as I drop coins in my can. Count along in your minds.

Use the tally chart to fill in the picture graph. Draw a tape diagram to show how many more books Jose read than Laura. If Jose, Laura, and Linda read 21 books altogether, how many books did Linda read? Complete the tally chart and the graph to show the answer...

Take your Application Problem and turn it sideways like mine. Talk with your partner: What do you notice about the picture graph when it’s turned this way? Talk with your partner: How can you tell by looking at the graph which category has more and which has less? Does the data change if I turn the graph sideways? True! So, we’re learning some interesting things about graphs. We can change the position of the graph from vertical to horizontal and the data stays the same. Template 1 from G2–M7–Lesson 1

And we learned we can show the same data in a table and in a picture graph. Well guess what? We can also show the information another way! We’re going to create a bar graph to show the data from our Animal Classification table. For our graph to make sense to someone who’s reading it, it needs to have a title. What is the title of our chart? We’re showing the same information, just in a different way, so the title stays the same. Fill in the title while I do the same. Chart 3 from G2–M7–Lesson 1 Animal Classification

How many categories of animals did we classify? Let’s label those same categories in the same order on the bar graph. How did we record the number of animals on the table? And how did we represent the number of each animal on the picture graph? Chart 3 from G2–M7–Lesson 1 Animal Classification

Watch how we represent data on a bar graph. First, I fill in the scale. What are we counting by? Yes. Whisper to your partner what the scale reminds you of. The scale tells us that each box equals one. How many Birds? How many Mammals? How many Reptiles? How many Fish? Chart 3 from G2–M7–Lesson 1 `

Now, just as with the picture graph, we can use the bar graph to ask and answer questions. How many more mammals than reptiles are there? How many fewer birds than reptiles are there? How would the graph change if we added four more birds to the bird category?