More Marvelous Math. Several publishers have whole series dedicated to math.
A Very Improbable Story: A Math Adventure by Edward Einhorn. This is one of many Charlesbridge Math Adventures. The Sir Cumference series is perhaps the most well known.
How Much Is a Million? 20th Anniversary Edition (Reading Rainbow Books) by David M. Schwartz. Others about millions by this author.
Building Math (Math Alive) by John Perritano, 2008. This is part of a series (Math Alive) with different authors. Science Math (Math Alive) by Dawn Stosch, Body Math (Math Alive) by Penny Dowdy, Travel Math (Math Alive) by Pia Awal Dutta, Transport Math (Math Alive) by Lesli Evans, Nature Math (Math Alive) by Penny Dowdy, and others.
Anno's Mysterious Multiplying Jar by Masaichiro Anno and Mitsumasa Anno
Sorting Money (A+ Books) by Jennifer Marks, 2007
Counting: Lift-a-flap fun (active Minds)
Counting Book photography by Dave King
Looking at Shapes (Yellow Umbrella Books) by Shirley Tucker and Jane Rambo, 2002. Part of an early reading series. What's Zero? (Yellow Umbrella Books) by Betsy Franco, 2002, Can You Eat a Fraction? (Yellow Umbrella Books) by Dlizabeth Dana Jaffe, and more.
The Crayola Counting Book by Rozanne Lanczak Williams, 1995
Cheerios Counting Book by Will Mcgrath and Barbara Mcgrath, 1998
Pepperidge Farm Goldfish Counting Fun Book by Barbara Barbieri Mcgrath, 2000
Case Of The Missing Birthday Party: Hello Math (Hello Math Reader, Level 4) by Joanne Rocklin, Part of a series with many other titles.
Go, Fractions! Ages 7-9 (All Aboard Math Reader, Station Stop 3) by Judith Bauer Stamper, 2003. Part of a series of math easy readers.
Usborne Illustrated Elementary Math Dictionary (Illustrated Dictionaries) by Kirsteen Rogers and Tori Large, 2010.
The Empty Pot by Demi, 2007
One Grain Of Rice: A Mathematical Folktale by Demi, 1997