Percentages made easy - fast shortcut trick! | Summary and Q&A

TL;DR

Learn a simple method to calculate percentages in your head without the need for a calculator or phone.

Key Insights

• 0️⃣ Mental math calculations can be made quick and convenient by using the canceling zeros and dividing by 10 method.
• 🥳 This method applies to a wide range of percentages and numbers, making it useful for day-to-day calculations.
• 👻 The simplicity of the method allows calculations to be done without the need for a calculator or phone.
• 0️⃣ Understanding the concept of dividing by 10 and canceling zeros is crucial for applying this mental math technique.
• 🍵 The method can handle percentages with both whole numbers and decimals.
• 🛟 Although more complex calculations may require additional techniques, this method serves as a solid foundation for mental math.
• 🐎 Practice and familiarity with the method can enhance speed and accuracy in mental percentage calculations.

Transcript

good day welcome to the tech math Channel what we're going to be having a look at in this video is a way of really rapidly working at percentages of a number okay and this is something you can easily do in your head uh as you as you're living your day-to-day lives without having to pull out a phone or anything like that to work it out a calculator ... Read More

Questions & Answers

Q: How does the method for calculating percentages mentally work?

The method involves canceling out zeros, dividing by 10, and multiplying the remaining digits to obtain the answer.

For example, to calculate 30% of 40, divide 30 by 10 to get 3 and divide 40 by 10 to get 4. Multiply 3 and 4 to get 12.

Q: Is this method applicable to numbers that are not multiples of ten?

Yes, the method still works for numbers that are not multiples of ten. By canceling out zeros and dividing by 10, you can calculate percentages like 20% of 18, which is 3.6.

Q: What if the percentage and number have decimals?

The method can still be applied. For example, to calculate 30% of 12, divide 30 by 10 to get 3 and move the decimal point in 12 to get 1.2. Multiply 3 and 1.2 to get 3.6 as the answer.

Q: Are there more complex calculations that can be done mentally using this method?

Yes, while this method works for most percentages, calculations with larger numbers and decimals may require additional techniques. A separate video linked in the content explains how to deal with such cases.

Summary & Key Takeaways

• The video explains a method to quickly calculate percentages of a number mentally.

• By canceling out zeros and dividing by 10, you can easily calculate percentages like 30% of 40 (which is 12).

• The method works for various percentages and numbers, making mental math calculations convenient and efficient.