Proportions and scale drawings/percents

Front

What is a proportion?

Back

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

Front

How do you find the constant of proportionality?

Back

The constant of proportionality can be found by dividing the total cost by the number of items purchased.

Front

What does it mean to scale a drawing?

Back

Scaling a drawing means to increase or decrease its size while maintaining the same proportions.

Front

If a worker uses 450 inches of wire to make 300 springs, how much wire is needed for 1 spring?

Back

1 1/2 inches.

Front

What is 400% of $1.50?

Back

$6.00.

Front

How do you calculate the percentage decrease in price?

Back

Percentage decrease = (original price - new price) / original price x 100.

Front

What is 25% of 1200?

Back

300.

Front

If 35% of Russell's pennies are dated from 1980 to 2000, how many pennies is that?

Back

420 pennies.

Front

What is the formula for finding the total cost in a proportional relationship?

Back

Total cost = constant of proportionality x number of items.

Front

How do you convert a fraction to a percentage?

Back

Multiply the fraction by 100.