A quick mnemonic for measuring angles with a protractor - Extend the rays, Estimate the answer (above or below 90 degrees) and now it's Easy to determine which number on the protractor to choose. Common Core Math standards require students to know and measure angles - but it is always confusing on how to do it easily and how to pick between the two numbers on the protractor. This can be used as a page in a math journal or projected to use as an anchor chart. Could also be sent home for parents to help them assist their child with geometry homework. From Terry Mullenax.