Convert to Decimal: Writing One and Twenty-Five Hundredths (1.25)

To solve this problem, we'll follow these steps:

• Step 1: Identify the whole number part from the phrase.
• Step 2: Convert the fractional phrase to a decimal.
• Step 3: Combine the whole number and decimal parts.

Now, let's work through each step:

Step 1: The phrase "one" corresponds to the whole number $1$.

Step 2: The phrase "twenty-five hundredths" refers to the decimal $0.25$. "Hundredths" means the second place to the right of the decimal point.

Step 3: Combine the whole number and the fractional part to form the decimal fraction, which is $1.25$.

Thus, one and twenty-five hundredths written as a decimal fraction is $1.25$, which matches choice 2.