The shark swimathon

As members of a swim team do laps to qualify for swim camp, readers can practice subtracting two-digit numbers to see how many laps are left to go.

Main Author:	Murphy, Stuart J., 1942-
Other Authors:	Cravath, Lynne Woodcock. (Illustrator)
Format:	Books Print Book
Language:	English
Published:	New York : HarperCollins, 2001.
Series:	MathStart
Subjects:	Subtraction > Juvenile nonfiction.