Books similar to the following can be used with the lessons in the fourth grade kit.

How Tall, How Short, How Far Away? by David A. Adler

Racing Around by Stuart J. Murphey

Long, Short, High, Low, Thin, Wide by James Fey

How Big is a Foot? By Rolf Myller

Big, Better, Best! by Stuart J. Murphy

Mike Mulligan and His Team Shovel by Virginia Lee Burton

Bats Around the Clock by Kathi Appelt

How Do You Know What Time It Is? by Robert E. Well

What’s Older than a Giant Tortoise? by Robert E. Well

Millions to Measure by David M. Schwartz

The Librarian Who Measured the Earth by Kathryn Lasky