Properties of Shape - Measure with a Protractor (1) - Worksheet

The worksheet titled "Measure with a Protractor (1)" is designed to enhance students' skills in measuring and understanding angles, specifically focusing on acute angles, which are less than 90°. The tasks require students to engage in both reasoning and problem-solving as they measure angles using a protractor. To begin, students are asked to order a set of angles by size, which challenges them to apply their knowledge and reasoning to explain their process. They are also tasked with reading angles from a protractor, estimating the size of these angles, and then measuring them to the nearest degree to assess the accuracy of their initial estimates. The worksheet encourages students to reflect on what is the same and what is different among the angles they work with.

Building on their understanding of right angles, the children learn to estimate the size of acute angles, such as considering an angle close to a right angle to be approximately 80°. The worksheet guides them through the use of both the inside and outside scales of a protractor and how to determine which scale to use for accurate measurement. Additionally, the exercises include scenarios where students must identify errors made by fictional characters in their angle measurements, fostering critical thinking and problem-solving abilities. For example, a character named Malachi might incorrectly measure an acute angle as 145°, and students must spot and explain why this measurement is incorrect. Through these activities, students develop a deeper understanding of angle measurements and the precision required when using a protractor.