How do we multiply powers of 10? Animation Play

How many different divisors does a natural number have? A more difficult problem Student activity Play

How many divisors? Animation Play

How many divisors? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Student activity Play

How much does it cost to watch television? Whiteboard exercise Play

How much does it cost to watch television? Student activity Play

How to calculate the power of an electric current Simulation Play

How to calculate the power of an electric current Student activity Play

How to calculate the power of an electric current Whiteboard exercise Play

How to calculate the work performed by an electric current Animation Play

How to save energy Student activity Play

How to save energy Simulation Play

How to transfer energy Simulation Play

How to transfer energy Animation Play

How to transfer energy Student activity Play

How to transfer energy Whiteboard exercise Play

How to use logarithms? Animation Play

How to write a number without too many zeros Student activity Play

How to write very big and very small numbers Student activity Play

Hydroelectric power station Illustration Play

Increasing or decreasing? Whiteboard exercise Play