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Instruction
Percentages
Calculate a percentage manually
A percentage is a ratio of parts of a whole and is expressed as a number per 100. Let's go back to our classroom data. If I gave an assignment, and half of the students passed, and the others failed, I could express that 50% passed and 50% failed. The two percentages add up to 100%.
In many schools, a grade of 70 and above is considered passing. Let's ta...