Learning about quarters (1st grade math lesson on coins)
I explain how a quarter is worth 25 cents. We figure out how much two or three or four quarters are, in cents, and learn why these coins are called "quarters". Then we go on to various coin-counting exercises that include quarters, dimes, nickels, and pennies -- and even Mathy gets to do some of those!
See also
Count money — practice counting money with this free online exercise
Shopping game — an online game where you buy stuff and practice coins!
Practice problems for making money amounts with cents — video lesson
Math Mammoth Money — an inexpensive self-teaching workbook on U.S. money
Math Mammoth Grade 1 curriculum