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Multiplying Powers
(KS3, Year 7)
The Lesson
Powers can be multiplied together. To multiply powers, add the exponents together.This is a law of exponents.
How to Multiply Powers
Multiplying powers is easy.Question
Use the law of exponents to multiply the powers below.StepbyStep:
1
Check that the bases of the powers are the same. In our example, the bases are both 2.
2
Find the exponents of the powers

Find the exponent of the first power. In our example, the first power has an exponent of 2.

Find the exponent of the second power. In our example, the second power has an exponent of 3.
3
Add the exponents from Step 2 (2 and 3).
2 + 3 = 5
4
Make the answer from Step 3 (5) the exponent of the base of the powers that have been multiplied.
Answer:
We have multiplied the powers together.Understanding Multiplying Powers
Let us look at the rule for multiplying powers: We are multiplying powers. 2^{m}, 2^{n} and 2^{m + n} are powers.
 The base in each power is 2. This law of exponents only applies when the bases are the same.
 The exponents in each power are m, n and m + n. This law of exponents applies even when the exponents are different.
Why Does It Work?
Consider the example below.Each term is given by:
s Multiplying the two together gives:
This shows why the formula given works.
Beware
The Bases Must Be The Same
The law of exponents discussed here only works when the bases are the same. The multiplication below cannot be simplified, and must be left as it is: Do you disagree with something on this page?
 Did you spot a typo?