Verified Answer :

Mathematics rule of rounding a number.
Let’s create a 7 digit number composed of 1-7 digits to be rounded to
6,300,000.



Let's have 6,312,457 in where:
 7=ones, 5=tens, 4=hundreds, 2=
thousands, 1= ten thousands, 3= hundred thousands, 6 = millions.      


Another rule in rounding off
numbers. Any number less than 5, round down. Any number more than 5, round up.

                                                                          
    Therefore:
6,312,457 will be rounded to  6,300,000.