Math Class: Percentages and Ratios

Converting Percentages to Ratios

• To express a percentage as a ratio, first convert the percentage to a fraction.
• 0.36% is equivalent to 0.36/100.
• Simplify the fraction by dividing both numerator and denominator by their greatest common factor, which is 0.04.
• This gives us 9/2500
• Therefore, 0.36% expressed as a ratio is 9:2500.

Population Increase Calculation

• The population increased from 268000 in 2007 to 375200 in 2010.
• This means the increase in population is 375200 - 268000 = 107200.
• The percentage increase is calculated by dividing the increase in population by the original population and multiplying by 100.
• Therefore the percentage increase is (107200/268000) * 100 = 40%.
• The population of the town increased by 40% over three years.

This quiz covers the conversion of percentages to ratios and the calculation of population increases. Understand how to express percentages in ratio form and calculate percentage increases based on population data over time.