The expression \(2.1 : 7\) represents the division of 2.1 by 7. 

Let's calculate:

\[
\frac{2.1}{7} = 0.3
\]

So, \(2.1 : 7 = 0.3\).

Would you like more details or have any other questions? Here are five related questions:

1. How do you convert a decimal like 2.1 into a fraction?
2. What are the steps to perform long division with decimals?
3. How can you verify division results using multiplication?
4. What is the importance of understanding ratio and proportion in mathematics?
5. How can you convert a division problem into a percentage?

**Tip:** When dividing decimals, if the divisor is not a whole number, consider multiplying both the divisor and dividend by a power of 10 to simplify the calculation.

Explore how to divide 2.1 by 7 step-by-step with a clear explanation. This problem covers decimal division and division of decimals by whole numbers. Suitable for students in Grades 4-6.

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