What’s the Magic Number? Finding 30% of 60

What’s the Magic Number? Finding 30% of 60

When it comes to calculating percentages, it can be confusing and overwhelming for some people. One of the most common percentages that people often struggle with is finding 30% of 60. In this article, we will walk you through the steps on how to easily calculate this and some useful tips on how to mentally calculate percentages.

Let’s dive in!

What is a Percentage?

A percentage is a fraction expressed as a part of 100. It is represented by the symbol % and is often used to compare or quantify things. Percentages are commonly used in many areas of life, including finance, science, medicine, and statistics.

Understanding 30% of 60

30% of 60 simply means finding 30 out of 100 parts of 60. This can be calculated using the following formula:

  • Step 1: Convert the percentage to a decimal
  • Step 2: Multiply the decimal by the whole number

So, for example, to find 30% of 60:

Step Formula Calculation
Step 1 30% = 0.30 0.30
Step 2 0.30 x 60 18

Therefore, 30% of 60 is 18.

Mental Calculation Techniques

Calculating percentages mentally can be a useful skill to have, especially for daily life calculations. Here are some mental calculation techniques that can make your life easier:

1. Half and Double Method

Using the half and double method involves multiplying or dividing the number by two to make it easier to calculate.

For example:

  • 30% of 60
  • Half of 60 is 30, so 15% of 60 is 30/2 = 15
  • 30% of 60 is double 15% of 60, which is 15 x 2 = 30

2. Multiplying by 10%

Multiplying by 10% can also be a useful technique. To do this, simply move the decimal point one place to the left.

For example:

  • 30% of 60
  • 10% of 60 is 6
  • 30% of 60 is 3 x 6 = 18

Common Mistakes to Avoid

Calculating percentages can be easy, but some common mistakes should be avoided:

  • Forgetting to convert the percentage to a decimal
  • Using the wrong percentage value
  • Using the wrong whole number
  • Not rounding off the final answer correctly

Tips to Make Calculating Percentages Easier

Here are some tips that can help you make calculating percentages easier:

  • Use mental calculation techniques to save time and effort
  • Practice calculating percentages regularly to improve your skills
  • Use a calculator if you are unsure or have to calculate complex percentages
  • Check your work for errors and be careful with decimal points


Calculating 30% of 60 is a common percentage problem that may seem challenging at first but can be easily solved with practice and the right techniques. Understanding the basics of percentages, using the right formula, and being aware of common mistakes and tips can make calculating percentages a breeze.

So, next time you face a percentage problem, remember what you learned and approach it with confidence.

Frequently Asked Questions

  • Q: What is a percentage?
    A: A percentage is a fraction expressed as a part of 100.
  • Q: How do I find 30% of 60?
    A: To find 30% of 60, multiply 60 by 0.30.
  • Q: What are some mental calculation techniques I can use to calculate percentages?
    A: Some mental calculation techniques include the half and double method and multiplying by 10%.
  • Q: What are some common mistakes to avoid when calculating percentages?
    A: Some common mistakes to avoid include forgetting to convert the percentage to a decimal, using the wrong percentage or whole number, and not rounding off the final answer correctly.


1. Brown, S. (2021). How to Calculate Percentages: 3 Easy Methods, Tips, and Examples. My Tutoring Source. https://mytutoringsource.com/how-to-calculate-percentages/

2. “Percentages.” MathIsFun. https://www.mathsisfun.com/percentage.html

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