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Indices: Higher Powers

# Indices: Higher Powers

### Indices: Higher Powers

Higher powers make numbers bigger very very quickly!

The index number $5^2$ is the same as_____

The index number $7^3$ is the same as______

Using the same principle as square and cube numbers, what is $2^5$ the same as?

What is $4^6$ the same as in the form $x \times x \times x...$?

1

Index numbers like $5^7$ are made up of a base number and a power. Which number is the power?

2

In the index number $5^7$:

The base number is $5$ The power is $7$

3

What is the base in the expression $a^n$?

4

Sometimes the power is also called the index.

In $a^n$ we can say $n$ is the power or the index.

1

Increasing powers makes numbers higher very very quickly!

For example, $5^1$ is just $5$, while $5^5$ is $3,125$

2

When numbers get very big very quickly like this

it is known as exponential growth.

What does $3^4$ actually equal?

What does $2^5$ equal?

1

A useful power to know is the power $1$. What do you think $2^1$ equals?

2

Now find $12^1$.

3

From this we can see that any number raised to the power $1$ is itself.

$x^1=x$

Summary!

1

Powers tell you how many times you should multiply the number by itself

For example $4^6$ is the same as $4$ multiplied by itself 6 times.

$4 \times 4 \times 4 \times 4 \times 4 \times 4$

2

Any number raised to the power $1$ is itself.

$x^1=x$

3

In the expression $x^y$

$x$ is the base number $y$ is the power

4

Increasing powers makes numbers higher very very quickly!

For example, $3^1$ is just $3$, while $3^8$ is $6,561$