Angle

Challenge students to estimate and record their answers first, and then use a 'Numberless Protractor' to measure each angle, calculate the error. Using a timer will create some 'urgency' for students to complete the task quickly. IWB software has built-in protractors (typically, a traditional protractor) and the Maths 300 lesson Angle Estimation has some some useful software.
 * Numberless Protractors** [[file:Numberless Protractor-180.pdf]]
 * Print onto OHP transperency, 10 to a page
 * Easy to use
 * Provokes '//reasonableness of answer//' approach to measuring angles
 * Requires users to count angles in '//lots of 10//' and then estimate the last part of an angle
 * Angle Estimation sheet** [[file:Angle Estimation.doc]]