GCSE Secondary Maths Age 13-17 - Number: Bounds and Percentages - Explained

The video tutorial covers two main topics: rounding numbers to significant figures and calculating percentage increases. It begins with an explanation of how to determine the least and greatest possible values of a house price rounded to two significant figures. The tutorial then shifts to calculating the original value of a house after a 5% increase. The video concludes with advice on exam preparation, emphasizing the importance of practicing past papers and understanding frequently tested topics like percentages and geometry.

What is the least possible value of a house rounded to 160,000 to two significant figures?

• 160,000

• 155,000

• 165,000

• 150,000

Which of the following is the greatest possible value of a house rounded to 160,000?

• 164,999.99

• 160,000

• 170,000

• 165,000

If a house's value increased by 5% to £210,000, what was its original value?

• £205,000

• £215,000

• £200,000

• £210,000

What percentage represents the original value of a house if its value increased by 5%?

• 105%

• 95%

• 100%

• 110%

How do you calculate 1% of a house's value if the total value after a 5% increase is £210,000?

• Multiply £210,000 by 1.05

• Divide £210,000 by 1.05

• Multiply £210,000 by 0.95

• Divide £210,000 by 100

Why is practice important in mastering the concepts of bounds and percentage calculations?

• It helps in memorizing the formulas.

• It ensures quick and clear thinking during exams.

• It reduces the need for understanding the concepts.

• It allows skipping practice questions.

Which topics are frequently tested in GCSE exams according to the summary?

• Physics and Chemistry

• Statistics and Calculus

• Percentages and Geometry

• Algebra and Trigonometry