To convert $\frac{2}{5}$ into tenths, we can multiply both the numerator and the denominator by 2, because $5 \times 2 = 10$.

$\frac{2}{5} \times \frac{2}{2} = \frac{4}{10}$

Thus, $\frac{2}{5} = \frac{4}{10}$.

Would you like more details or have any questions?

Here are 5 related questions for further practice:

1. Convert $\frac{3}{5}$ into tenths.
2. Change $\frac{7}{10}$ into fifths.
3. What is $\frac{6}{8}$ as a decimal?
4. How do you convert $\frac{9}{4}$ into a mixed number?
5. Simplify $\frac{12}{20}$ to its simplest form.

Tip: To convert fractions, find a number that you can multiply or divide both the numerator and the denominator by to reach the desired form.