Good early mathematics is broader and deeper than early practice on "school skills." High-quality mathematics should be a joy--not a pressure. It can emerge from children's play, their curiosity, and their natural ability to think. This article describes the areas of mathematics that young children can learn, and encourages elementary teachers to make mathematical development part of their everyday routine. The most important math for young children can be broken down into two main areas: (1) geometric and spatial ideas; and (2) numeric and quantitative ideas. Research shows that young children possess intuitive and informal capabilities in both of these areas. Three other mathematical themes that should be woven through experiences in these two main areas are: (1) patterns; (2) sorting and sequencing; and (3) measurement and data.