I am pretty sure this is possible. In New Zealand teachers use something called cusinere rods, which are rods whose length corresponds to their values(Ie something of 2 value is twice the size of 1 value)
Also it is worth looking at the work of Glenn Doman in the USA who developed some interesting techniques for brain damaged children. When he applied his work to normal children, some as young as 2 years old were able to distinguish numbers up to 50 and more quite easily. Why do I subscribe to what he did? My wife taught my daughter at the age of 2 to read using his methods. She quickly became proficient enough to read words that were beyond her stage of mental comprehension demonstrating that the act of reading does not necessarily have to include its comprehension (not that I advocate that but the skill of reading and the skill of comprehension are two separate things)