Challenge your mathematical problem solving skills with problems similar to those found on math contests such as the AMC 8, AMC 10, MATHCOUNTS, or the middle school math olympiads. I post a problem set each week, and then come back later in the week and post the answers and video solutions.

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I have noticed that you got number 4 in this set(set 4) wrong. It should be 100 degrees between the minute and the hour hand instead of 140 degrees.

Hi, Michael. Thanks for catching that. It looks like the video was cut off prematurely. I think I went on to take the difference between the 240 degrees of the minute hand with respect to 12 o’clock and 140 degrees of the hour hand with respect to 12 o’clock to get 100 degrees between the minute and hour hands. I’m going to need to re-record that video.