Unit 14. Ratio and Proportion. Year 9

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

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

Front

What is proportion?

Back

Proportion is an equation that states that two ratios are equal.

Front

How do you find a missing value in a proportion?

Back

Cross-multiply the known values and solve for the unknown value.

Front

If a recipe uses 120g of chocolate for 12 cakes, how much chocolate is needed for 30 cakes?

Back

300g of chocolate.

Front

What is the ratio of red bricks to blue bricks if there are 3 red bricks for every 4 blue bricks?

Back

The ratio is 3:4.

Front

How do you convert a ratio to a fraction?

Back

To convert a ratio to a fraction, write the first term as the numerator and the second term as the denominator.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit.

Front

How do you determine which item is a better value for money?

Back

Calculate the cost per unit for each item and compare the values.

Front

If a car uses 7.5 litres of petrol for 120 miles, how far can it travel on a full tank of 54 litres?

Back

864 miles.