The number 2 and 5/10 can be written as a decimal by converting the fraction $\frac{5}{10}$ to its decimal equivalent.

Since $\frac{5}{10} = 0.5$, the number becomes:

$2 + 0.5 = 2.5$

So, the number in standard (decimal) form is 2.5.

Would you like more details on how fractions convert to decimals?

Related Questions:

1. How do you convert fractions like $\frac{3}{4}$ to decimal form?
2. How can you express 3 and $\frac{7}{100}$ as a decimal?
3. What is the decimal form of $0.75$?
4. How can you round 2.567 to the nearest tenth?
5. How do you add decimals like 2.5 and 3.75?

Tip: When converting fractions to decimals, dividing the numerator by the denominator gives the decimal form.