Bedtime Math: This Time It's Personal (Bedtime Math Series)
Bedtime Math: The Truth Comes Out (Bedtime Math Series)
How Many Guinea Pigs Can Fit on a Plane?: Answers to Your Most Clever Math Questions (Bedtime Math)
Do Not Open This Math Book: Addition + Subtraction
Amazing Visual Math
The Boy Who Loved Math: The Improbable Life of Paul Erdos
Math for Love Tiny Polka Dot
Which One Doesn't Belong?: Playing with Shapes
Learning Resources Sum Swamp Game, Addition/Subtraction, Early Math Skills, 8 Pieces, Ages 5+
What Should Danny Do? (The Power to Choose Series)