Since base is common,apply the product of powers property: a^m·aⁿ= a^{m + n}.

10⁶ · 10⁷ = 10^{6 + 7}

= 10¹³                            (Add exponents: 6 + 7 = 13)

The product of  10⁶ · 10⁷ is 10¹³.