• # question_answer What is the usual form for $2.3\times {{10}^{-10}}?$

$2.3\times {{10}^{-10}}=23\times {{10}^{-1}}\times {{10}^{-10~}}$              $=\text{ }23\times {{10}^{-11}}~$ $=\frac{23}{100000000000}$ = 0.0000000023