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

The video tutorial explains how to estimate the number of prizes won in a 24-hour period when a prize is won every 2014 seconds. The key is to round figures to one significant figure before performing calculations. The teacher demonstrates the process by rounding 2014 seconds to 2000 seconds and calculating the total number of seconds in 24 hours. The division of these figures results in an estimate of 36 prizes. The tutorial also covers the marking scheme, emphasizing the importance of rounding and showing all work. Key tips for estimation questions are provided, highlighting the need to round before calculating.

What is the key step to perform before starting any estimation calculation?

• Convert all units to minutes

• Use a calculator

• Round all figures to one significant figure

• Estimate the final answer directly

How many seconds are there in 24 hours, rounded to one significant figure?

• 70,000

• 80,000

• 90,000

• 60,000

If a prize is won every 2000 seconds, how many prizes are estimated to be won in 24 hours?

• 36

• 24

• 60

• 48

Which of the following is NOT a part of the marking scheme for the estimation question?

• Final answer

• Division process

• Rounding to one significant figure

• Using a calculator

What is the most important thing to remember when dealing with estimation questions?

• Use complex arithmetic

• Ignore significant figures

• Round off before any calculations

• Round off after calculations