text: Algebra 1
  
  $4 \times 10^3$
  $a^m \cdot a^n = a^{m+n}$ Multiply the corresponding parts and use the rule above when necessary to obtain: $=4 \times (10^6 \cdot 10^{-3}) \\=4 \times 10^{6+{-3}} \\=4 \times 10^3$