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

The video tutorial explains how to round a number to one decimal place and determine the error interval for the rounded number. It covers the concepts of upper and lower bounds, demonstrating how to calculate them to establish the error interval. The tutorial also discusses the importance of understanding these concepts for exams, particularly in the context of GCSE papers.

What is the purpose of determining an error interval for a rounded number?

• To estimate the range within which the original number lies

• To find the exact value of the number

• To determine the number of decimal places

• To calculate the average of the number

If a number is rounded to 7.2, what is the lower bound of the error interval?

• 7.1

• 7.15

• 7.3

• 7.25

What is the upper bound of the error interval for a number rounded to 7.2?

• 7.15

• 7.3

• 7.25

• 7.2

Why is the upper bound not included in the error interval?

• Because it is equal to the lower bound

• Because it is less than the lower bound

• Because it is not a valid number

• Because it would round up to the next decimal

How many marks are awarded for correctly determining the error interval?

• One mark

• Four marks

• Three marks

• Two marks