Multiply the whole number by 100. The resulting answer is its value as a percentage. Another way is to add a decimal point after the whole number such as 4, and then move the decimal two spaces to the right, fill in each of those empty spaces with a zero, and add a percentage symbol = 400%.
Answer: 0.4 can be written in a fraction as 4/10 or 2/5. Explanation: First, we need to remove the decimal. For that, we multiply and divide by 10 as there is only one digit after the decimal.