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The core idea, one worked example, and short practice.
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A two-way table sorts a group of people two ways at once, like boys and girls across Yes and No. Each box inside the table is a cell, and it holds a count of people.
The Total column on the right is the row added across. The Total row along the bottom is the column added down. The bottom-right corner is everyone.
Most questions ask you to turn a count into a fraction or a percent. The count you want goes on top. The group the question asks about goes on the bottom. If it says "of all 50 students," the bottom is 50. If it says "of the boys," the bottom is only the boys.
To make a percent, turn the bottom number into 100 if you can, or divide the top by the bottom and move the decimal point two places to the right.
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