5.2 Unit Rates Lesson - kutz
 A rate is a ratio that compares two different kinds of quantities.2 teachers for 24 students:2 teachers24 students=12teacherstudents 15 strike-outs in 9 innings15 strike-outs9 innnings=strike-outsinnings When you have a unit rate, the second quantity is 1.Example 240 miles in 4 hours.240 miles4 hours÷44=mileshour Suppose you drove to San Francisco in 3 hours. What would be the unit rate?don't forget the unit - mph96 miles ÷  3 hours =An easier way is to simply divide thedistance by the time.( miles per hour ) We use unit rates all the time. Many people are paid by the hour.Suppose you work at a coffee shop and make\$9.50 an hour and work 8 hours.How much would you make?\$9.50 x 8 hours = \$76.00Suppose you stayed late and worked 10 hours?\$9.50 xyour answer is money so it needs 2 decimals places and a \$ sign =  example - \$75.00 An ice cream cone may be 35 calories per ounce.If the ice cream cone is 7 ounces, how many calories are in the ice cream cone.Suppose a different cone was 45 calories/ounce. How many calories would be in the whole cone?35  calories/oz.  x  7 ounces = 245 caloriescalories/oz.  xdon't forget the unit - caloriesoz.  = Unit rates can be used to find the better buy.\$1.20  ÷ 16  =  \$A)     12 ounce can of soda for \$.84B)     16 ounce bottle for \$1.20\$0.84 ÷ 12 =  \$What's the better deal?/ oz./ oz.16 oz. bottle12 oz. can What's the better buy?A)  4 oz.  Snickers Bar for \$0.80B)  6 oz.   3 Musketeers Bar for  \$0.903 MusketeersSnickers There are 350 students in 11 classes. About howmany students are in each class?Sometimes you just want to estimate the unit rate.Use compatible numbers.350 ÷ 10 would be So what would be the best guess ( estimate )?350 students per class10 students per class32 students per class39 students per classstudents per class There are 123 students in 6 classes. About howmany students are in each class?Sometimes you just want to estimate the unit rate.Use compatible numbers.120 ÷ 6 would be So what would be the best guess ( estimate )? 15 students per class18 students per class 21 students per class 6 students per classstudents per class
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