## MSTAR Interventions

### Key Ideas

• Ratios describe the relationship between quantities with the same unit. (See Lesson 1.)
• Ratios can be generated to represent situations in real life. (See Lesson 2.)
• Ratios compare quantities and can be simplified like fractions. (See Lesson 3.)
• Rates compare unlike quantities. (See Lesson 4.)
• Rates can be simplified like ratios, using common factors. (See Lesson 5.)
• A unit rate describes how many units there are of the first quantity for 1 unit of the second quantity. (See Lesson 6.)
• Equivalent ratios describe the same relationship between objects, which means they can be simplified to the same ratio. (See Lesson 7.)
• Multiplication can be used to generate equivalent ratios. (See Lesson 8.)
• Unit rates can be generated by using a table. (See Lesson 9.)
• Equivalent rates can be generated by calculating the unit rate and then multiplying to find the equivalent rate. (See Lesson 10.)
• Rates can be compared by calculating and comparing the unit rates. (See Lesson 11.)