log 12900 is equal to

Hi We have log12900 I am assuming base 10 log12900 = log129*100 = log129+log100 ( log a +log b = log ab) now log 100 = 2 so we have log 129+2 now log 129 will also be close to 2 since log 1000 =3 so 2+log129 should be approximately 4.1 to 4.15