Henry keeps score /
by Daphne Skinner ; illustrated by Page Eastburn O'Rourke.
- New York : Kane Press, 2001.
- 32 p. : col. ill. ; 23 cm.
- Math matters. .
Henry wants to make sure that his older sister Harriet never gets more of anything than he does so he carefully keeps score until Harriet gets a cavity and he gets none and Henry discovers that sometimes zero is better than one.