Ratios, Proportions & Percents

Front

What does it mean for two objects to be similar?

Back

Two objects are similar if they have the same shape but not necessarily the same size.

Front

If 14 out of 50 fish caught were trout, what is the proportion of trout in the sample?

Back

The proportion of trout is 14/50 or 0.28.

Front

How do you calculate the expected number of trout in a lake if you know the sample size and total population?

Back

Use the proportion of trout in the sample to estimate: (Number of trout in sample / Total fish in sample) * Total population.

Front

What is the formula to find what percent one number is of another?

Back

(Part / Whole) * 100 = Percent.

Front

If 10 is 31.25% of what number, how do you find that number?

Back

Divide 10 by 0.3125 to find the whole number.

Front

How do you determine how long a larger bottle of shampoo will last based on a smaller bottle's usage?

Back

Use the ratio of the sizes of the bottles to find the expected duration: (Size of larger bottle / Size of smaller bottle) * Duration of smaller bottle.

Front

What is the constant of proportionality in a proportional relationship?

Back

It is the ratio that remains constant between two quantities.

Front

If selling 5 phones earns $215, how do you find the earnings per phone?

Back

Divide total earnings by the number of phones: $215 / 5 = $43 per phone.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing the relative size of one quantity to another.

Front

What is a proportion?

Back

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