A Dollar, a Penny, How Much and How Many? (Math Is CATegorical ®)

The Mission of Addition (Math Is CATegorical ®)

A Second, a Minute, a Week with Days in It: A Book about Time (Math Is CATegorical ®)

The Action of Subtraction (Math Is CATegorical ®)

A Fraction's Goal — Parts of a Whole (Math Is CATegorical ®)

On the Scale, a Weighty Tale (Math Is CATegorical ®)

A Mink, a Fink, a Skating Rink: What Is a Noun? (Words Are CATegorical ®)

Zero the Hero

Rock, Brock, and the Savings Shock

The Berenstain Bears' Trouble with Money (First Time Books(R))