Reviewed by Janice S. Armas
What is 30% of 90?
Answer: 30% of 90 is 27
Finding a percentage of a number means determining how much the given percentage is as a part of that number. In this case, calculating 30% of 90 tells us what value represents 30 percent of 90.
Methods
Math Tutor Explanation Using the Percentage Formula
You can use the percentage formula to calculate a specific percentage of any number. This method multiplies the number by the percentage expressed as a decimal.
Step 1: Convert 30% to a decimal by dividing by 100, which gives 0.3
Step 2: Multiply 0.3 by 90 to find the answer
Math Tutor Explanation Using Proportion Method
Another way is to set up a proportion to solve for the missing value representing 30 percent of 90.
Step 1: Set up the proportion 30/100 = x/90
Step 2: Solve for x by cross-multiplying (30 × 90 = 100 × x), then dividing both sides by 100
Step 1:
Step 2:
Math Tutor suggests: More Practice with Percentage Calculations
Sharpen your skills in calculating percentages of numbers with these related exercises.
FAQ on Finding Percentages
How do I convert a percentage to a decimal?
You divide the percentage by 100 to convert it to a decimal.
Can I use a calculator for percentage problems?
Yes, calculators are helpful for multiplying decimals and checking your answers.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100 to convert the result to a percent.
What is a quick way to check my answer?
Reverse the calculation: check if your answer divided by the original number gives the correct decimal for the percentage.
Math & reading from 1st to 9th grade
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