Students can practice lining up and measuring a virtual protractor on the MathPlayground website. The Measuring Angles game allows players to measure angles from 0 to 180 degrees and only 1 degree of error is allowed. Ten problems are generated and students are prompted to determine whether angles are obtuse (between 90 and 180 degrees) or acute (between 0 and 90 degrees), in addition to answering measurement questions. Alien Angles is a computer game at the MathPlayground site that enlists players' help to right an off-course space ship using angles and a provided protractor.
The Almost Unschoolers' blog hosts instructions for an activity that makes paper plates into protractors. Students cut half the plate away, mark the rim with degree markings and measure angles of things around the house. Students can print several different types of protractors from the Ossman website, and the markings from this site can be used on the paper-plate protractors as well. The site has conventional protractors that measure angles in degrees, but also has a pdf file for decimal-spread protractors that measure quadrance. There is also a fractional-spread protractor using fractional measurements.
Students can model the seasons with a lesson plan from the Exploratorium. Styrofoam globes on straws turn with the seasons as students mimic the sun with flashlights. A protractor is used in this activity to make sure the Earth is at the correct angle on its axis.
Students can study a worksheet and flashcards with audio on the Quizlet site. The site also has a customizable quiz that can be answered with true or false, matching, multiple choice or written questions. The flashcards, worksheets and quizzes can be used online or can be printed for later use.
Students can play two online protractor games at the Ambleside Primary School's website. What's My Angle? provides students with 10 variations on an angle game, allowing them to make and measure their own angles with a virtual protractor that can be moved over the angles to measure them on screen. Players can choose games with up to 90 or 180 degree angles in ones, fives and tens as well as an estimation game. Angle Activities, on the same site, provides problems for students to solve using their virtual protractors online.