Let $N$ be a positive integer. Suppose given any real $x\in (0,1)$ with decimal representation $0.a_1a_2a_3a_4\cdots$, one can color the digits $a_1,a_2,\cdots$ with $N$ colors so that the following hold:
    1. each color is used at least once;
    2. for any color, if we delete all the digits in $x$ except those of this color, the resulting decimal number is rational.
Find the least possible value of $N$.

[i]~Sutanay Bhattacharya[/i]

To solve this problem, we need to determine the smallest number \( N \) such that any real number \( x \in (0,1) \) with a decimal representation \( 0.a_1a_2a_3a_4\cdots \) can have its digits colored with \( N \) colors satisfying the given conditions.

1. **Proving \( N \geq 10 \) works:**

   - Consider the decimal expansion of \( x \).
   - Color the first \( N \) digits with \( N \) different colors in any order.
   - From that point on, color every \( 0 \) with the first color, every \( 1 \) with the second color, and so on, up to every \( 9 \) with the tenth color.
   - If \( x \) has a finite decimal expansion, assume there are infinitely many zeros after the last non-zero digit.
   - For each color, the decimal number formed by the digits of that color eventually becomes a single digit repeated, making it rational.

2. **Proving \( N \leq 9 \) cannot work:**

   - Consider the number \( x = 0.0123456789001122\cdots 8899000111\cdots 9990000\cdots \).
   - The \( i \)-th block has \( 0 \) repeated \( i \) times, \( 1 \) repeated \( i \) times, and so on up to \( 9 \) repeated \( i \) times.
   - Suppose we can color this with \( N \) colors as stipulated.
   - Let \( x_i \) be the decimal formed by all the digits with the \( i \)-th color.
   - Since \( x_i \) is rational, its decimal expansion is eventually periodic with period length \( d_i \).
   - Let \( A \) be the position of the last digit in \( x \) that occurs in any of the non-periodic parts of the \( x_i \)'s.
   - Let \( M = \max\{d_1, d_2, \ldots, d_N\} \).
   - In the decimal expansion of \( x \), there is a string of at least \( N(M+1) \) consecutive zeros after the \( A \)-th place.
   - Some color must have at least \( M \) zeros from this part, say the \( j \)-th color.
   - Then \( x_j \) has a string of at least \( d_j \) zeros after its non-periodic part, making the entire period a string of zeros.
   - Thus, after some point, all the digits of \( x_j \) are \( 0 \).
   - Similarly, for every digit \( d \) in \(\{0, 1, \ldots, 9\}\), there is some \( x_j \) such that all digits of \( x_j \) are \( d \) after some point.
   - Since there are ten possible digits and only \( N < 10 \) possible \( x_j \)'s, this is impossible.

Therefore, the least possible value of \( N \) is \( 10 \).

The final answer is \( \boxed{10} \).