title: Add leading numbers to Numbers in Dataframe
body: <p>have a df </p>
  
  <pre><code>a         b
  
  mark     50
  
  john     60
  
  jack     30
  
  harry     80
  
  jacob     10
  </code></pre>
  
  <p>Need to add new values here it is (141) to b column, type of b columns is <code>numpy.int64</code>  into the df like this </p>
  
  <pre><code>a         b
  
  mark     14150
  
  john     14160
  
  jack     14130
  
  harry     14180
  
  jacob     14110
  </code></pre>