Selling lemonade to earn money for new books, Tad, Lily, Leap and friends use their counting, addition and subtraction skills every step of the way.
2011
1923
1973
1946
1940
1998
2004
1969
2012
2009
1956
1981
1988
2002
1938
2013
2003
2008
1970
1945
