The factors which you change (vary) are called variables.
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The variable that stays the same throughout the entire experiment is called the control.
Constant variable
When you change the order of the factors in a multiplication equation, it is called the Commutative Property of Multiplication. This property states that changing the order of the factors does not change the product. Similarly, when you change the order of the addends in an addition equation, it is called the Commutative Property of Addition. This property states that changing the order of the addends does not change the sum.
Yes.
If you change more that one variable in an experiment, then when the result occurs, you won't know which variable caused the change.