how to do 345x 7.899=
Multiply 345 x 7899 in the usual manner (taught in an earlier grade) and move the decimal point three pleces to the left.
Or enter 345*7.899 into Google.com
http://www.google.com/search?hl=en&source=hp&q=345*7.899&btnG=Google+Search&aq=f&aqi=&aql=&oq=&gs_rfai=C13GgSCKVTNbpLJ-qoASq58GFDAAAAKoEBU_QdfEl