The comparison between the correct and submitted answers can be done using three different methods: relabs, sigfigs and decdig. For example:

1) relabs uses relative (rtol) and absolute (atol) tolerances:

Calculate the area of a square with size equal to $1.5$ cm:

Area $\;=$ cm$^2$

2) sigfig uses significant digits:

If $b = 4.016$, determine the product $2b$:

$2b =$