### Video Transcript

What is the length of each interval in the given line?

First, we need to think about what an interval is. The space between each dash mark is the interval. To find the interval, we can find the difference between 960 and 949.

To find the difference, we will use subtraction. We will subtract 949 from 960. I need to borrow one of the tens place. So now I can say 10 minus nine is one. Five minus four is one. Nine minus zero is zero.

This tells me that there is a space of 11 between 949 and 960. Let’s check our answer by looking at another interval on the line. This time, we’ll go from 1004 to 1015.

We want to know if we add 11 to 1004, will it equal 1015? It does! If you add 11 to 1004, it’s equal to 1015. This confirms that the interval of this line is 11.