Elementary Test Prep: Math 4 Test (Grades 3-4) Events That Are Certain and Impossible

Lesson Page Uncertainty

An event is something that will happen.

An event is certain if it will always happen.

An event is impossible if it will never happen.

Example 1: Event
You call a friend on the telephone.
An event is something that happens.

Example 2: Certain
You will eat. Think: You have to eat to live.
An event is certain if it will always happen.

Example 3: Impossible
You will see pigs flying. Think: Pigs do not fly.
An event is impossible if it will never happen.

Example 4: Certainty and Impossibility
	A die numbered 1-6 is rolled. It is certain that the die will land on a number 1 - 6. It is impossible that the die will land on number 10.

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