Ratio and Rate Section 5.1
Objectives • Write a fraction that shows a ratio comparison of two like measurements • Write a fraction that shows a rate comparison of two unlike measurements • Write a unit rate
Objective 1:Write a fraction that shows a ratio comparison of two like measurements
Objective 1 • Numbers can be compared by subtraction • Can be compared by division • Ratio is comparison by division • Common ways to write ratio. 30:10 30 ÷ 10 30 to 10 • First number to be compared is first number written or is the numerator. Second number second or is the denominator.
Objective 1 • Ratios written as fractions can be simplify, if possible • Like measurements have same unit of measure • Units are dropped in ratio with like measurements
Objective 2:Write a fraction that shows a rate comparison of two unlike measurements
Objective 2 • Fraction comparing unlike measurements is called a rate • Rate can be simplified • Units are NOT dropped
Objective 3 • Unit rate – rate rewritten so denominator is 1-unit measurement • To write a unit rate • Divide • Keep unlike units