Pie Chart
Pie charts are great graphs because they tell you so much at a glance. Still, there are some calculations that you need to know.
Lets assume that 4000 gallons of water are used in a day. How many gallons of water are used for the toilet?
First, convert the percent into a decimal (just move the decimal to the left 2 places)
26.8% = 0.268
Then, multiply the total amount of water by that decimal.
4000 x 0.268 = 1072
And there's your answer! 1072 gallons of water are used for the toilet daily.
NOTE: Sometimes pie charts will give you numbers instead of percents. If that happens, you need to total up all the numbers before you start finding the percents for each section.
Lets assume that 4000 gallons of water are used in a day. How many gallons of water are used for the toilet?
First, convert the percent into a decimal (just move the decimal to the left 2 places)
26.8% = 0.268
Then, multiply the total amount of water by that decimal.
4000 x 0.268 = 1072
And there's your answer! 1072 gallons of water are used for the toilet daily.
NOTE: Sometimes pie charts will give you numbers instead of percents. If that happens, you need to total up all the numbers before you start finding the percents for each section.
Bar Graphs
Bar graphs are great graphs because they can show cause and effect. Which is another way of saying the Independent and Dependent Variable
Independent Variable = The part of an experiment that you control and change. The cause.
INdependent = IN control
Dependent Variable = The part of an experiment that changes due to the independent variable. The results.
Control = The normal condition in an experiment or the untouched experiment.
Look at the graph to the left. Can you pick out the independent variable, dependent variable and the control?
In this graph the independent variable is the amount of acid we add to the plant. The dependent variable is the growth or height of the plant. And the control is the tall purple bar which received no acid.
Independent Variable = The part of an experiment that you control and change. The cause.
INdependent = IN control
Dependent Variable = The part of an experiment that changes due to the independent variable. The results.
Control = The normal condition in an experiment or the untouched experiment.
Look at the graph to the left. Can you pick out the independent variable, dependent variable and the control?
In this graph the independent variable is the amount of acid we add to the plant. The dependent variable is the growth or height of the plant. And the control is the tall purple bar which received no acid.
Rates - Distance vs Time Graph
A distance vs time graph tells a story. It shows how far someone has gone and sometimes shows when they come back. The y axis will tell you how far from the start you are. Study the picture to the left carefully and know what types of lines represent which types of movement.
Rates - Velocity vs. Time Graph
A velocity vs. time graph focuses on the speed and acceleration. It doesn't tell you how far you are from somewhere but rather, it tells you if you're speeding up or slowing down or staying at a constant rate. Study the picture to the left carefully and know what types of lines represent which types of movement.