Reviewed by Florence Khitsane
What is 20% of 45?
Answer: 20% of 45 is 9
Finding a percentage of a number is a common arithmetic task that involves multiplying the number by a fraction or decimal form of the percentage. In this case, you are looking to determine what 20 percent of 45 is, which helps you understand proportions and parts of whole numbers.
Methods
Math Tutor Explanation Using the Decimal Method
Percentages can be converted to decimals by dividing by 100. You can then multiply the decimal form by the given number to find the answer.
Step 1: Step 1: Convert 20% to decimal by dividing 20 by 100, which is 0.2
Step 2: Step 2: Multiply 0.2 by 45 to get the result
Math Tutor Explanation Using the Fraction Method
Percentages can be written as fractions. Multiply the original number by the percentage in fraction form and simplify.
Step 1: Step 1: Write 20% as a fraction, which is 20/100 or 1/5
Step 2: Step 2: Multiply 45 by 1/5 to find the answer
Step 1:
Step 2:
Math Tutor suggests: Practice More Percentage Calculations
Sharpen your skills with more practice questions involving finding percentages of numbers.
FAQ on Percentages
How do you convert a percentage to a decimal?
Divide the percentage by 100
What is the formula to find a percentage of a number?
Multiply the number by the percentage as a decimal
Can you also solve percent problems using proportions?
Yes, set up a proportion: part/whole = percent/100
Why is it useful to know how to find a percentage of a number?
It helps in daily activities like shopping, budgeting, and analyzing data
Math & reading from 1st to 9th grade
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