Problem of the Day

Express $2/lb in cents / ounce.

Ratio and Proportion

A ratio is a comparison of two numbers by division. The ratio of a to b is a:b or a/b where b is not equal to zero.

Rate is a comparison of a/b where a and b represent two different units. m/h, $/h, $/package The unit rate is a a rate with a

denominator of 1 $3.15/ 1 gallon $2.50/ 1 gallon

Find the unit rate of an ounce of catsup.

$.72/16 ounces—Divide numerator and denominator by 16.

$.045/ounce is the unit rate.

Converting rates

The boy ran 10,560 feet in 4 hours. What was his speed in feet per minute?

10,560 feet/4 hr x 1hr/60min=176 feet/min

A proportion is an equation that states two ratios are equal.

t/9 = 5/6 is a proportion. To solve for t cross-multiply and divide.

9 ∙ 5 = 6 ∙ t 45 = 6 t 45/6 = t t = 7.5

You try it.

A sloth travels .15 miles per hour. Convert this speed to feet per minute.

Solve x/4 = 25/12 24/5 = y/7 54/d = 72/64

Homework

P. 185 and 186 (2-40even )