TY - BOOK AU - Murphy, Stuart TI - Ready, set, hop! SN - 0-06-446702-3 AV - TR(GS 513.2'11 M874 1996 PY - 1996/// CY - New York PB - HarperCollins Publishers, Inc KW - Addition--Juvenile literature KW - Subtraction--Juvenile literature N2 - Explains equation building as two frogs count their hops to a rock, a log, and a pond ER -