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## 2nd grade

### Course: 2nd grade > Unit 7

Lesson 3: Line plots# Making picture graphs and line plots

CCSS.Math:

To create a line plot, first create a number line that includes all the values in the data set. Next, place an X (or dot) above each data value on the number line. If a value occurs more than once in a data set, place an Xs over that number for each time it occurs.

## Want to join the conversation?

- why do we use picture graphs?(17 votes)
- I think we use picture graphs to make the understanding better. It is a great way to visualize the math problem and be able to answer it much more easier(15 votes)

- Where can we apply these line plots??(10 votes)
- In the animation fields, architecture and also in higher grades....(7 votes)

- why do we use picture graphs(8 votes)
- So we can get "used to" or make it easier for us to see the graph, and trust me when you get into higher math it gets harder without picture graphs...(7 votes)

- I learned about picture graphs but not line plots and also do we actually use line plots or do we just use them in khan academy?(7 votes)
- You will encounter them at various stages as you move along through different math classes. Certainly used places other than Khan Academy.(9 votes)

- it is not garagh is graph

Graph is something which we counght on it(3 votes)

- whats a number line(6 votes)
- Good question! A number line is usually a horizontal line used for visualizing the relationships between numbers, including whole numbers, integers, decimals, fractions, and irrational numbers (for example pi, square root of 2, etc). Larger numbers are placed to the right of smaller numbers. Numbers to the right of 0 are positive, numbers to the left of 0 are negative, and 0 is neither positive nor negative.

Sometimes a number line is vertical. Then greater numbers are placed above smaller numbers.

Number lines are often used in algebra and for displaying data (for example dot plots and histograms). When you study graphing points and equations on a coordinate grid, you will see two number lines: a horizontal line called the x-axis, and a vertical line called the y-axis. Coordinate grids are also used to create scatterplots that display two-variable data.

Have a blessed, wonderful day!(5 votes)

- are line plots a tipe of number line 'cause it kinda looks like it(4 votes)
- Yeah, you use a number line as a base for a line plot. In the future you will learn that there are other ways to use a number line.(4 votes)

- How do you know what number is first in a line plot and what number is last in a line plot(4 votes)
- could you use somthing else besides dots on a line plot(5 votes)
- Yes, other than a dot, you could also use "x"'s or pictures to show how many of each item.(0 votes)

- why do we use line plots and other types of graphs(3 votes)
- so we can know how much things there are and how to add them up more easily! XD(3 votes)

## Video transcript

- Create a picture graph to show how many wands each fairy owns. So Glenda owns two wands,
Tink owns three wands, Merry owns four wands, and
Gracie owns five wands. And in our picture graph,
each picture of a wand represents one wand, it
is equal to one wand, it means one wand. All right, so Glenda has two wands. So let's see, I'll click
one, two wands for Glenda. Tink has three wands. So I'm gonna have one,
two, three wands for Tink. Merry has four wands, so I'll have one, two, three, four wands for Merry. And then Gracie has five wands. So I'm gonna have one, two, three, four, five wands for Gracie. Let me check my answer, let's keep going, this is actually a lot of fun. The zookeeper measured four penguins. Their heights were 40, 44,
48, and 48 centimeters. Make a line plot of their heights. So a line plot, we have
a number line here, and we wanna put a dot,
as many dots as we have, at a certain measurement. So we have one penguin
that it was 40 centimeters, so at 40 we have one
penguin right over there. We have another penguin
that's at 44 centimeters. So we put 44 right over there. And then we have two
penguins at 48 centimeters. So we could put two dots right over there. Two penguins at 48 centimeters. So there you go. That is our line plot. Let's keep going, this is a lot of fun. There are five books on the shelf. The heights of the books are 32, 36, 38, 32, and 35 centimeters. Make a line plot of the heights. So let's see, there is one
book that is 32 centimeters. Then there is a book
that is 36 centimeters. Then there is a book
that is 38 centimeters. Then there is another book
that is 32 centimeters. So we actually have two books, one, two books that are at 32 centimeters. And then one book that is at 35. So there you go, I made the line plot. And remember, all a line
plot is is it's essentially counting how many of each height we have. We have two at 32 centimeters, one at 35 centimeters,
one at 36, and one at 38. Let's do one more of these. Robin Hood measured four arrows. The lengths were 26, 26,
23, and 25 centimeters. Make a line plot of the lengths. So we have two arrows that were 26, that were 26 centimeters. So on 26 on our number line here I'm gonna put two dots. We have an arrow that's 23 centimeters, so I'll put one dot there. And then I have one arrow
that is 25 centimeters. So I'll put a dot there. And we're done.