Mutliplying decimals with numbers 
Lets do the following multiplication 
 25
 x419
9x25 = 2 2 5
1 x 25 = 2 5 0
4 X25 = 100 0 0 ...... add colums from top to bottom 
 = 1 0 4 7 5 
for a decimal , just add a dot . or comma after 104 , this will be 104.75
 so 25 x 4.19 = 104.75