Step by step
The question
Question: A card is picked from a deck of 52 cards.
What is the probability it is a king?
The probability is a fraction: the outcomes we want, over all the outcomes.
P stands for probability.
1 Count all outcomes
A deck has 52 cards.
It has 4 suits: hearts, diamonds, clubs and spades.
Each suit has 13 cards.
4 times 13 is 52.
2 Count the ones we want
Kings: 4.
That is 4 outcomes we want.
3 Write the fraction
4 we want, out of 52.
So the probability is 4/52.
Careful!
The bottom is all the outcomes, 52.
Not only the other 48.
4 Simplify
Both 4 and 52 can be divided by 4.
That makes it simpler.
So it is 1/13.
5 As a percent
Percent means out of 100.
1/13 means 1 divided by 13.
Then times 100.
To the nearest tenth, that is about 7.7%.
6 Check
Let's check with the others.
52 minus 4 is 48.
4/52 plus 48/52 is 52/52: that is 1, all of them.
So the answer is right!
Let's look back.
First: count all outcomes.
Then: count the ones we want.
Then: write the fraction.
Then: simplify.
Then: as a percent.
Last: check.