5.1/2 Rates and Ratios Objective: Students will be able to write simple ratios three ways. They will also be able to make simple conversions. With the ratios, students will also be able to order them from least to greatest.

Information Ratio: use division to compare quantities. Must be simplified! 3 ways to write: a to b 2 to 3 a : b 2 : 3 a / b 2 / 3 Measurements: 1ft = 12in 1yd = 3ft = 36in 1h = 60min = 3600 sec 1lb =16oz 1mile = 5280ft. 1m = 100cm = 1000mm 1km = 1000m

Teacher ratio ex: Write 2 other ratios for 4:5 9 to 12 Person shoots 10 baskets. He made 8 and missed 2 Write ratio of makes to misses Write a ratio of misses to total.

St. ratio Ex. Write as two other ratios 15/3 50:6 An eagle has a wing length of 124cm and a length of 13cm. Write a ratio of length to wing length.

Order least to greatest 2 to 9, 1:7, 7/28, 2 to 6 1 to 3, 2/8, 5:18, 7 to 20

Order the ratios least to greatest

Unit rates Unit rate: rate when denominator is 1 Ex: mile/hour Find unit rates of: 140mi / 4gal. $161 / 7 shares

Unit rates – St. 20ounces / 2.5 serving 1125 cal. / 4.5 hours 140 words / 4 min.

Equivalent Ratios Equivalent if same value 8 to 21 and 45 / 126

Equivalent Rates NOTE: pay attention to measurements! 5m = ?m 1sec 1h 5cm = ?cm 1min 1h 5m = ?m 1sec 1h

Equivalent Rates St 300 mi = ? mi 20 sec. 1min $43 = ? Dollars 1 day 1 week

Wrap-up Questions/Comments I.C/hw: worksheet