Final answer:
To convert 3.5 to a percentage, multiply it by 100. This results in 350%, indicating that 3.5 is equivalent to 350%.
Step-by-step explanation:
To convert the decimal 3.5 to a percentage, you multiply it by 100.
This is because a percentage represents a number out of 100. So, you perform the following calculation: 3.5 × 100 = 350.
Therefore, 3.5 as a percentage is 350%.