7th Grade Ratios and Proportional Relationships

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you find the unit rate?

Back

To find the unit rate, divide the quantity by the number of units. For example, if a car travels 320 miles in 8 hours, the unit rate is 320 miles ÷ 8 hours = 40 miles per hour.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the constant value (k) that relates two proportional quantities, often represented as y = kx.

Front

How do you determine the better buy between two products?

Back

To determine the better buy, calculate the unit price for each product and compare them. The product with the lower unit price is the better buy.

Front

If a car travels 240 miles in 6 hours, what is the unit rate?

Back

40 miles per hour.

Front

What is the formula for finding the price per item?

Back

Price per item = Total price ÷ Number of items.

Front

If 5 apples cost $3, what is the cost per apple?

Back

$0.60 per apple.

Front

What does it mean if two quantities are directly proportional?

Back

If two quantities are directly proportional, as one quantity increases, the other quantity increases at a constant rate.

Front

What does it mean if two quantities are inversely proportional?

Back

If two quantities are inversely proportional, as one quantity increases, the other quantity decreases.