since 2004 is a leap year, how many "remainder" days are in February? Show the division sentence.
Remainder from what? What does 2004 have to do with it?
If you divide 365 or 366 days (in a year) by 12 months you get five or six "remainder 31st days" that are distributed among Jan, Mar, May, July, Aug, Oct and Dec. One or two days are also taken AWAY from February so that there can be seven 31-day months.
Augustus Caesar had something to do with robbing February so he could have an extra day in the month that he named after himself.