STAAR Review Proportionality Tutorials (2025)

Triangle KLM is similar to triangle RTU. The triangles are shown with side lengths in centimeters.

What is the length of side RU in centimeters?

A survey of 150 employees at a company asked which type of transportation the employee used to get to work.

If Bicycles is 10%, then how many more people use a car than ride a bicycle to get to work?

(Car% - bicycle%) x 150 = ?

The cost of groceries for the Nguyen family was $210.00. The family used a coupon for 25% off the cost. 

 

What was the final cost after the coupon was used?

Cost - discount = ? or 75% x 210

The ratio of blue to yellow to green gumballs in a gumball machine is 4 : 3 : 1.

There are 24 yellow gumballs in the machine.

How many blue gumballs are in the machine?

Spinner X is divided into 4 equal sections, and Spinner Y is divided into 3 equal sections. The possible outcomes for each spinner are shown in the tree diagrams.

 

Both spinners are spun at the same time. What is the probability that Spinner X will land on 2 and Spinner Y will land on blue?

A diver had descended 64 feet underwater after 4 minutes.

After 6 minutes, the diver had descended 96 feet underwater.

 

What is the constant of proportionality that relates the number of

feet descended, y, to the number of minutes, x?

A deck of cards contains red, blue, orange, and yellow cards.

A card is drawn and then replaced.

This process is carried out 40 times.

Based on these results, what is the experimental probability that the next card drawn is red or (+) orange?

In a city, the average cost of electricity is $0.12 per kilowatt-hour.

Which graph best represents this relationship?

12 kwh x 0.12 = ?

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