Finding the Measure of a an Angle Based on one Ray Going through a Number Not Zero

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It is 8:59 in length

This problem was from question number 6 on the fourth grade test from last year and got only 30% correct in Texas. It required your students noticing that none of the rays went through zero from either side. In the video I show you how to use subtraction to use the difference of two points on to check the measurement.