The book "Extra Credit" by Andrew Clements has 16 chapters.
the hammer is on page 27 hanging on the sixth broken slat of the boat (counting from the bottom)
there are 156 pages in snow treasure
Treasure of Khan has 560 pages.
The Treasure of the Humble has 225 pages.
Treasure Box has 310 pages.
The Tower Treasure has 216 pages.
The Treasure of El Patron has 70 pages.
The Treasure of Alpheus Winterborn has 180 pages.
The Treasure in the Royal Tower - novel - has 150 pages.
I found it! Its on page 14 its in the picture with the riddle that says I fought and I stole fine treasures of gold it’s in the clouds!
Extra- ordinary - People has 161 pages.