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Algebra Application: Cicada Cycles 
In this Algebra Application, students study the life cycles of 13 and 17year cicadas, as well as the populations of bird predators. Students develop a mathematical model using spreadsheets and investigate why the prime number life cycles help the cicadas. The math topics covered include: 

Closed Captioned Video: Ratios: Unit Rates 
DescriptionVideo Tutorial: Ratios: Unit Rates. In this video we look at unit rates. 

DefinitionRatios, Proportions, and Percents ConceptsCalculating Tax 
DefinitionRatios, Proportions, and Percents ConceptsCalculating TaxThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsCalculating Tips 
DefinitionRatios, Proportions, and Percents ConceptsCalculating TipsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsConverting Units 
DefinitionRatios, Proportions, and Percents ConceptsConverting UnitsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsDimensional Analysis 
DefinitionRatios, Proportions, and Percents ConceptsDimensional AnalysisThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsEquivalent Ratios 
DefinitionRatios, Proportions, and Percents ConceptsEquivalent RatiosThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsParttoPart Ratios 
DefinitionRatios, Proportions, and Percents ConceptsParttoPart RatiosThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsParttoWhole Ratios 
DefinitionRatios, Proportions, and Percents ConceptsParttoWhole RatiosThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercent 
DefinitionRatios, Proportions, and Percents ConceptsPercentThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercent Decrease 
DefinitionRatios, Proportions, and Percents ConceptsPercent DecreaseThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercent Increase 
DefinitionRatios, Proportions, and Percents ConceptsPercent IncreaseThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercent of a Number 
DefinitionRatios, Proportions, and Percents ConceptsPercent of a NumberThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercent of an Unknown 
DefinitionRatios, Proportions, and Percents ConceptsPercent of an UnknownThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsPercents as Decimals 
DefinitionRatios, Proportions, and Percents ConceptsPercents as DecimalsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsProportion 
DefinitionRatios, Proportions, and Percents ConceptsProportionThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsProportional 
DefinitionRatios, Proportions, and Percents ConceptsProportionalThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRate 
DefinitionRatios, Proportions, and Percents ConceptsRateThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatio 
DefinitionRatios, Proportions, and Percents ConceptsRatioThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios and Fractions 
DefinitionRatios, Proportions, and Percents ConceptsRatios and FractionsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios and Slope 
DefinitionRatios, Proportions, and Percents ConceptsRatios and SlopeThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios in Simplest Form 
DefinitionRatios, Proportions, and Percents ConceptsRatios in Simplest FormThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios with Decimals 
DefinitionRatios, Proportions, and Percents ConceptsRatios with DecimalsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios with Fractions 
DefinitionRatios, Proportions, and Percents ConceptsRatios with FractionsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 

DefinitionRatios, Proportions, and Percents ConceptsRatios with Percents 
DefinitionRatios, Proportions, and Percents ConceptsRatios with PercentsThis is part of a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. 