Find the difference between the decimals represented by the points g and h on the given number line.
Consider the given number line.

Observe that:
The distance between 0 and 1; 1 and 2 each is divided into 10 equal parts.
So, each part represents a length of one-tenth or 0.1.
Now, count the number of parts from 1 to g.
There are 6 parts.
This means that the point g is 6 parts to the right of 1 or 6 tenths after 1.
Now, 1 and 6 tenths equals 1.6.
So, the decimal represented by the point g is 1.6.
Similarly, the decimal represented by the point h is 1.9.

Now, let's find the difference between the decimals represented by the points g and h.
Notice that point h is 3 parts ahead of point g.
Also, we know each part represents a length of one-tenth or 0.1.
So, 3 parts is 3 tenths or 0.3.
The difference between the decimals represented by the points g and h is 0.3.