# MATH

• WELCOME TO MATH!

We have been working with a few different types of graphs.
Graphs allow us to see data (information) in sort of a picture summary.
A graph takes information (like what the students in our class prefer to eat for breakfast: eggs/cereal/bagels) and then presents it (or sets it in front of us) in one image so we can quickly compare the information it contains.

Today we are going to work with line graphs. Line graphs show us how data changes over time.
Let's say we want to know how much hot chocolate the students of our class consume (drink) over one year. Chances are, they would drink very little hot chocolate in the summertime, but would drink lots of it in the wintertime. We could create a line graph which would show us in one image how the amount of hot chocolate the students consume changes throughout the months of the year.

When you make a line graph, you connect points on a grid. Please look in your textbook at page 236. The temperature outside is something that changes over time, and p. 236 shows you a graph of the changes.

Each line graph contains a horizontal (or side-to-side) axis/line.
It also contains a vertical (or up-and-down) axis/line.
The graph on p. 236 shows you which axis is which. Look for the words, vertical axis and horizontal axis highlighted in yellow.

Whenever the Science Club wanted to show what the temperature was on a given day, they had to find the spot on the graph where the vertical axis and horizontal axis would cross.
IN OTHER WORDS,
►try placing the index finger of your left hand on the 25º shown on the vertical axis.
►now place the index finger of your right hand on the word, 'Tues.' on the horizontal axis.
►Then, glide your left finger across and your right finger up until they meet (you can follow the red dotted lines drawn on the graph).
►The point where your fingers meet is where they placed the dot to show 'What the temperature was on Tuesday.'

Every day, the Science Club placed a dot on the chart to show the temperature for that day.
Then they could compare whether the temperature was going up or down, and by how much.

►Using the line graph on p. 236, please answer questions 1-3 at the bottom of page 236.
(I am placing the answers to numbers 1-3 at the bottom of this page, so you can check to see if you are doing it right :)

Sometimes, the line between two points on a line graph does not go up or down, but just goes straight across. This type of line shows there was NO CHANGE in data.

Are you ready to try it?
Complete the problems on page 237. You will find the answers below so you can check your work.
(No peeking until you have the question answered!)

*********** YOU HAVE NO MATH TO SUBMIT TODAY ************