Construyamos Un Patio De Juegos (building A Playground)
Resumen del Libro:

There is a contest at a school to design a new playground. The students use blocks to build their models. As they build, they use three-dimensional shapes. Some students build a train out of blocks for the younger students to play on. Can you guess which three-dimensional shape they use for the trains wheels? Read to find out which design wins.
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