GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Ratios - Explained

The video tutorial explains how to correctly determine the ratio of chocolates containing nuts to those without. Initially, a common mistake is highlighted where the ratio is incorrectly assumed to be 1:4. The correct method is demonstrated, showing that if a quarter of the chocolates contain nuts, the remaining three-quarters do not, leading to a correct ratio of 1:3. The tutorial emphasizes understanding through diagrams and explains the marking scheme for the problem.

What fraction of the chocolates in the box contain nuts?

• Three quarters

• One half

• One quarter

• One third

What is the common incorrect ratio given for chocolates with nuts to those without?

• 1:5

• 1:4

• 1:3

• 1:2

If 1/4 of the chocolates have nuts, what fraction do not have nuts?

• 1/4

• 1/2

• 3/4

• 1/3

What is the correct ratio of chocolates with nuts to those without?

• 1:3

• 1:2

• 1:4

• 1:5

How many marks are awarded for correctly changing the ratio from 1/4 to 1:3?

• Two marks

• Three marks

• Four marks

• One mark