Question

What is the rough estimate and closer estimate of $4125+139+62$?

Answer 1

Step 1: For a rough estimate of $4125+139+62$.

$4125$ is rounded off to $4000$.

$139$ is rounded off to $100$.

$62$ is rounded off to $50$.

So, the final rough estimate is $4000+100+50=4150$.

Step 2: For a closer estimate of $4125+139+62$.

$4125$ is rounded off to $4120$.

$139$ is rounded off to $140$.

$62$ is rounded off to $60$.

So, the closer estimate is $4120+140+60=4320$.

Hence, the rough estimate is $4150$ and the closest estimate is $4320$.