Objective 12/09/09 Objective 12/09/09 The students will be The students will be able to solve for the able to solve for the missing value in a missing value in a proportion and solve proportion and solve word problems by word problems by using cross-products. using cross-products.
Objective 12/09/09. The students will be able to solve for the missing value in a proportion and solve word problems by using cross-products. A PowerPoint Presentation by Mrs. Mary Angel Alim- Flores. Proportions. Making Iced Tea. Making Iced Tea. Making Iced Tea. Making Iced Tea. - PowerPoint PPT Presentation
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Objective 12/09/09Objective 12/09/09
The students will be able to The students will be able to solve for the missing value solve for the missing value in a proportion and solve in a proportion and solve word problems by using word problems by using cross-products.cross-products.
A PowerPoint Presentation
by Mrs. Mary Angel Alim- Flores
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
44
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
44 88
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
44 88 1212
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
44 88 1212 1616
Making Iced TeaMaking Iced Tea
Cups of Cups of waterwater 11 22 33 44 1010
Iced Iced TeaTea
(tsp)(tsp)
44 88 1212 1616 4040
Two equal ratios form a Two equal ratios form a PROPORTION.PROPORTION.
Grace and James are on a Grace and James are on a swimming team. Their swim swimming team. Their swim training is 200 meters and training is 200 meters and usually takes them 3 minutes. usually takes them 3 minutes. How long, at this rate, would it How long, at this rate, would it take them to complete an 800-take them to complete an 800-meter swim? meter swim?
1. 1. Set up the proportion:Set up the proportion:
metersmeters 200200 = = 800800
minutes 3 nminutes 3 n
2. Use cross-products2. Use cross-products
200(n)= 200 n then 3(800)= 2400. 200(n)= 200 n then 3(800)= 2400.
3. Divide both sides by 2003. Divide both sides by 200
n=12n=12
Answer: 800-meter swim will take them 12 minutes.Answer: 800-meter swim will take them 12 minutes.
A car travels 125 miles A car travels 125 miles in 3 hours. How far in 3 hours. How far would it travel in 5 would it travel in 5 hours?hours?
A car travels 125 miles in 3 hours. How far A car travels 125 miles in 3 hours. How far would it travel in 5 hours?would it travel in 5 hours?
Step 1 Set up the proportion.Step 1 Set up the proportion.
miles miles 125125 = = hh
hours 3 5hours 3 5
Step 2 Solve for the missing value (h).Step 2 Solve for the missing value (h).
Step 3 Divide both 625 and 3h by 3Step 3 Divide both 625 and 3h by 3
Answer: 208.33 or 208 1/3 milesAnswer: 208.33 or 208 1/3 miles
RECAPRECAPToday I learned…Today I learned…
The steps in solving proportions are…The steps in solving proportions are…
Trip Around the WorldTrip Around the World
1. 1. U.S.AU.S.A2. Philippines2. Philippines3. Australia3. Australia4. Canada 4. Canada 5. Japan 5. Japan
EXIT TICKETEXIT TICKET
A 380- cubic cm sample of A 380- cubic cm sample of titanium has a mass of 1710 g. titanium has a mass of 1710 g. Find the weight of a titanium Find the weight of a titanium sample that has a volume of sample that has a volume of 532 cubic cm. Explain how you 532 cubic cm. Explain how you got your answer.got your answer.