Variables

What are variables in math?

• Letters

• Numbers

• Expressions

What you measure or observe in an experiment.

• constant variable

• controlled variable

• dependent variable

• independent variable

All the things that have to stay the same in an experiment (except for the one thing you change).

• constant variable

• controlled variable

• dependent variable

• independent variable

Justin wants to determine the effect of fertilizer on the growth of grass. What is the independent variable?

• amount of fertilizer

• height of grass

• type of plant

• time

Justin wants to determine the effect of fertilizer on the growth of grass. What is the dependent variable?

• amount of fertilizer

• height of grass

• type of plant

• time

Randell wants to determine if salt in the water has an effect on his goldfish. What is the independent variable?

• how much salt is in the water

• temperature

• health of his goldfish

• amount of algae in the tank

Julie wants to know the effect of studying 10 minutes extra each day on her Math. What is the independent variable?

• time

• studying 10 extra minutes

• her math grade

Joe wants to determine the effect of pesticides on the size of apples in the orchard. What is the dependent variable?

• amount of bugs

• size of apples

• use of pesticides

• number of apples

The variable that is being tested, counted, or measured and is responding to the independent variable is known as 

• Control
• Constant
• Independent Variable
• Dependent Variable

Which brand of paper towel will absorb the most liquid? What is the independent variable?

• Brand of paper towel
• Amount of water absorbed