Grade 4 - Progress in Mathematics

Update your skills. See page 26.

Line Graphs

7-3

A line graph shows how data

changes over time.

The Movie Museum keeps track of

how many visitors it has each year.

About how many visitors did the

museum have in 2000?

To find how many:


Find the year on the

horizontal axis.


Move up to the point.


Read the number on the

vertical scale at the left.

The point is abouthalfway between 30,000 and 40,000.

The number 35,000 is halfway between 30,000 and 40,000.

So the museum had about35,000 visitors in 2000.

A line graph shows when data increases

and when it decreases.

Did attendance at the museum increase

or decrease from 1999 to 2005?

The line slants up, so attendance increased.

Yo u can often use a line graph to predict

how data will continue to change.

Is the museum likely to have fewer than or more

than 64,000 visitors in 2006?

The number of visitors has increased since 1999. It is

likely that the number of visitors will continue to increase.

1999200020012002200320042005

60,000

50,000

40,000

30,000

20,000

0

Attendance

Year

Yearly Attendance

increasing

decreasing

A broken scale is used since

the data starts at 20,000.

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