Curated OER
Measuring the Lengths Using Rulers
Why are there so many lines on a ruler? Scholars measure length on two rulers, one standard and one metric. They measure in inches, millimeters, and centimeters with the centimeter measurement including a fraction. Because these are the...
Alberta Learning
Area and Perimeter of Irregular Shapes
Evaluate young mathematicians' understanding of area and perimeter with this series of three assessment tasks. Challenging students to not only calculate the area and perimeter of irregular shapes, but to explain in writing their...