Over at Collaboration Cuties the maths mentor text linky is about sharing a text that uses estimation to help in daily math/s.
This book is a favourite of mine.
The author likes to collect facts with the help of his dog, Frank. Each two-page spread of this book includes a different fact involving such mathematical topics as counting, size comparison, and ratio along with delightful illustrations.
The pictures are funny and engaging and they lead to great discussions.
Read, investigate and enjoy!