GCSE Secondary Maths Age 13-17 - Number: Area and Mass - Explained

The video tutorial explains how to calculate the total mass of 25 sheets of A3 card. Each sheet has an area of 1/8 meter squared and a mass of 160 grams per meter squared. The instructor demonstrates the calculation by first finding the mass of one sheet, which is 20 grams, and then multiplying by 25 to get a total of 500 grams. The importance of using correct units is emphasized, as well as the allocation of marks for the problem. The tutorial concludes with a reflection on the straightforward nature of the arithmetic involved.

What is the area of one sheet of A3 card?

• 1/2 meter squared

• 1/8 meter squared

• 1/4 meter squared

• 1 meter squared

How much does one sheet of A3 card weigh?

• 40 grams

• 20 grams

• 80 grams

• 10 grams

What is the total mass of 25 sheets of A3 card?

• 500 grams

• 400 grams

• 550 grams

• 450 grams

Which of the following is a correct way to express the total mass of 25 sheets?

• 0.5 kilograms

• 5 kilograms

• 500 kilograms

• 50 kilograms

How many marks were awarded for using the correct unit in the answer?

• 1 mark

• 4 marks

• 2 marks

• 3 marks