How To Find The Percent of a Number Fast!

TL;DR

This video provides simple techniques for mentally finding the percentage of a number, using decimal shifting and multiplication.

Transcript

in this video we're going to focus on how to find the percent of a number so let's start with something simple let's say if we have 400 what is 10 of 400 to find 10 of something simply move the decimal one unit to the left so 10 percent of 400 is 40. well that's straightforward all right so let's say if we want to find 20 of 500 what is twenty perc... Read More

Key Insights

• 🗨️ Moving the decimal one unit to the left reveals the value for 10% of a number.
• ✋ Multiplying the value for 10% can give the value for higher percentages (e.g., 20%, 30%).
• 😵 Cross-multiplication with decimal values can be used to check the accuracy of the calculated percentages.

Questions & Answers

Q: What is the technique for finding the percentage of a number mentally?

The technique involves shifting the decimal one unit to the left for 10% and then multiplying the value accordingly for other percentages.

Q: How can we find 20% of a number if we know 10%?

To find 20% of a number, double the value of 10% as 20% is twice the value of 10%.

Q: How can we find 15% of a number if we know 10% and 5%?

To find 15% of a number, add the value of 10% and 5%, as 15% is the sum of the two. Calculate each percentage separately and then add them.

Q: How can we find a specific percentage, such as 23%, of a number?

To find a specific percentage like 23%, break it down into known percentages (20% and 3%), calculate them individually, and then add the results together.

Summary & Key Takeaways

• The video explains that to find a percentage of a number, one can move the decimal one unit to the left for 10%, and multiply the value accordingly for other percentages.

• Examples are given for finding 20% of 500, 30% of 150, 15% of 400, and 25% of 700, demonstrating the step-by-step process.

• The calculations are checked using cross-multiplication with decimal values, ensuring accuracy.