GCSE Secondary Maths Age 13-17 - Number: Comparison - Explained

The video tutorial explains how to determine the best value for money among three different sizes of toothpaste tubes. It involves calculating the cost per millilitre for each tube size and comparing them to find the cheapest option. The tutorial also outlines the marking criteria for the question, emphasizing the importance of showing all calculations and correctly identifying the best value tube.

What are the three different sizes of toothpaste tubes mentioned?

• 50 ml, 75 ml, 125 ml

• 55 ml, 70 ml, 130 ml

• 30 ml, 60 ml, 90 ml

• 40 ml, 80 ml, 120 ml

How do you calculate the cost per millilitre for the 50 ml toothpaste tube?

• Subtract 50 from £1.09

• Add 50 to £1.09

• Multiply £1.09 by 50

• Divide £1.09 by 50

Which toothpaste tube size offers the best value for money?

• 75 ml

• 125 ml

• 50 ml

• 100 ml

What is the cost per millilitre for the 125 ml toothpaste tube?

• 0.02152

• 0.0230

• 0.0224

• 0.0218

What is one of the criteria for earning a mark in the marking scheme?

• Using a pen

• Writing neatly

• Correctly identifying the cheapest cost per millilitre

• Using a calculator