The divided water tank
Make the tank’s parts finer: the water stays put while the fraction’s name changes. See equivalent fractions.
Protractor
Drag or type an angle: acute, right and obtuse angles; complementary and supplementary angles; a triangle’s angle sum and exterior angle.
In the learning section below the figure, predict, try, complete the tasks and check yourself with short questions.
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The gearbox
Change the number of teeth: teeth and turns are inversely proportional, and their product stays the same.
Exponential growth: the lily pond
If the leaves double every day, on which day is the pond half full? Compare linear, exponential and logistic growth side by side.