is a square number.
can also be written as . This is pronounced " squared".
is a cube number.
can also be written as , which is pronounced " cubed".
The notation and is known as index form. The small digit is called the index number or power.
You have already seen that and that .
Similarly, (five to the power of )
and (three to the power of ) .
The index number tells you how many times the number should be multiplied.
is 'seven squared'.
is 'three cubed'.
is 'three to the power of seven'.
is 'four to the power of five'.
Look at the table and work out the answers. The first has been done for you.