Final answer:
To write the fraction 30 as a decimal, divide 30 by 100. This can be done by moving the decimal point two places to the left, resulting in 0.3.
Step-by-step explanation:
To write the fraction 30 as a decimal, divide 30 by 100. This is because fractions with a denominator of 100 can easily be converted to decimals by moving the two decimal places to the left. So, 30/100 = 0.3.