1. A plurality of six-sided blocks which can be arranged in different configurations for aiding the teaching of mathematical concepts comprising: at least twenty-five blocks including various sized cubes and rectangular blocks, each block having predetermined dimensions corresponding to numbers in the Fibonacci series, said series formed, commencing with 1, 1,..., by adding the present number to the prior number to form the next number in the series, a plurality of at least seven cubes, each cube having a predetermined dimension corresponding to specific numbers included in the series, commencing from a base cube of unity dimension, said dimension representing the first number in the series, with cube sizes increasing sequentially commensurate with series, and, a plurality of at least eighteen rectangular blocks having individual predetermined height and width dimensions equal to a corresponding cube dimension, with predetermined length dimensions increasing sequentially by next larger number in the series.