Approximating the area under a line in the coordinate system Student activity Play

Approximating the area under the function graph Whiteboard exercise Play

Approximating the area under the line in the coordinate system Whiteboard exercise Play

Approximating the area using strips Animation Play

Figures made up from four strips Animation Play

How to measure the pH? Animation Play

Kites Student activity Play

Properties of kites Animation Play

Quadrilaterals Student activity Play

The pH scale Student activity Play