Probability for Kids: How Likely Is It? Chance from 0 to 1 (Grade 7 Math)

Hi, I'm Luna from DoodleBeez. Today we are learning about probability. Probability tells us how likely something is to happen. We write it as a number from zero to one.

A probability of zero means impossible, like rolling a seven on a normal number cube. A probability of one means certain. One half means an even chance, like a coin landing on heads.

To find a probability, count the outcomes you want and divide by all the possible outcomes. A number cube has six outcomes. The chance of rolling a four is one out of six, or one sixth.

A bag holds three red marbles, five blue marbles and two green marbles. That is ten in all. The probability of red is three tenths. The probability of blue is five tenths, which is one half.

The probability that something does not happen is one minus the probability that it does. The chance of green is two tenths, so the chance of not green is eight tenths, or four fifths.

Theory says a coin lands on heads half the time. But if you flip it ten times, you might get six heads. That is called experimental probability. With more flips, results usually get closer to one half.

Now it's your turn. A spinner has eight equal parts, and three of them are yellow. What is the probability of landing on yellow? Pause and try. It is three eighths. And not yellow is five eighths.

Great job! Remember, probability goes from zero, impossible, to one, certain. Divide the outcomes you want by all the outcomes, and subtract from one for not happening. Practice probability in Middle School Math at doodlebeez.com. See you next time!