ron lost 10 points seven times playing a video game. He then lost an additional 100 points for going over the time limit. What was the total change in his score?

10 points X 7 times = 70 points

Additional 100 points = 100 points

70 points + 100 points = 170 points

To find the total change in Ron's score, we need to calculate the sum of the points he lost from losing 10 points seven times and the additional 100 points for going over the time limit.

First, let's calculate the points Ron lost from losing 10 points seven times.

To find this, we multiply the number of times Ron lost points (seven) by the points lost per time (10).
7 * 10 = 70

So Ron lost 70 points from losing 10 points seven times.

Now we need to add the points lost for going over the time limit, which is 100 points.

To find the total change in Ron's score, we add the points lost from losing 10 points seven times to the additional points lost for going over the time limit.
70 + 100 = 170

Therefore, the total change in Ron's score is a decrease of 170 points.