​[[$$ a^n \cdot a^m = a^{n+m} $$]]​
Esimerkkejä:

• [[$ a^2 \cdot a^3 = a^{2+3} = a^5 $]]
• [[$ a \cdot a^3 = a^{1+3} = a^4 $]]
• [[$ a^{-2} \cdot a^3 = a^{-2+3} = a^1 = a $]]​
• ​[[$ a^{5} \cdot a^{-5} = a^{5-5} = a^0 = 1 $]]​