Question

Jane has made an error while marking three numbers on the number line. Determine the number that has been marked incorrectly.

• A. $23.45$
• B. $23.12$
• C. $23.87$
• D. Cannot be determined

Answer 1

The correct option is C $23.87$

● Let’s mark $23.12,23.55$, and $23.87$ on a number line.


● The value on a number line increases from left to right.
● In the question, $23.45$ is marked between $23.5$ and $23.6$.
● $23.87$ is more than $23.8$ and less than $23.9$.
● So, $23.87$ should lie somewhere between $23.8$ and $23.9$
● This means that $23.87$ is marked incorrectly in the question.
● Hence, option C is the correct answer.