Converting Decimal to Words: Express 0.561 in Written Form

To solve this problem, let's follow these steps:

• Step 1: Identify the number of decimal places in $0.561$, which is three.
• Step 2: Express the decimal as a fraction. Since there are three decimal places, $0.561$ corresponds to $\frac{561}{1000}$.
• Step 3: Write the fraction in words. The fraction $\frac{561}{1000}$ is expressed as "561 divided by 1000".

Therefore, the decimal $0.561$ in words is "561 divided by 1000".