Mathematics is a way of thinking (Reys, Robert E., Suydam, Marilyn N., & Lindquist,
Mary M., 1984). It provides us with strategies for organizing, analyzing, and
synthesizing data, largely but not exclusively numerical. That’s why mathematics
couldn’t be seen as a concrete object in order to make it real when people are talking
about it. Number becoming one thing that people always talk until now is an object
for mathematics. Number on mathematics is an object used to count and measure. In
early age of young children, the phenomenon of conservation of number reflects how
children think. Moreover, we will come true to the fact of number sense for children
when they used to solve their problem