How To Find a Percent of a Number - Without a Calculator!

TL;DR

Learn how to find percents mentally by moving decimals and using easy calculations.

Transcript

in this video we're going to talk about how to find percents mentally so let's start with something simple what is 10 of 200 10 percent of 200 all you need to do is move the decimal one unit to the left 10 percent of 200 is 20. so knowing that what is one percent of 200 one percent of 200 is basically 10 of 20 which all you need to do is move the d... Read More

Key Insights

• #️⃣ Moving decimals helps to find percentages of numbers quickly and mentally.
• 🥳 Breaking percentages into smaller parts and adding them together simplifies the calculation process.
• ❓ Calculating mental percentages can be confirmed with a calculator using the decimal equivalent of the percentage.

Questions & Answers

Q: How do you find 10 percent of a number mentally?

To find 10 percent, move the decimal one unit to the left. For example, 10 percent of 200 is 20.

Q: How do you find 20 percent of a number mentally?

Double the value of 10 percent. For example, 20 percent of 250 is twice 10 percent (25) which is 50.

Q: How do you find a percentage that is not a multiple of 10?

Break it down into smaller parts. For 15 percent of 300, find 10 percent (30) and 5 percent (half of 10, which is 15), then add them together to get 45.

Q: How can you confirm your mental calculation using a calculator?

Multiply the number by the decimal equivalent of the percentage. For example, for 15 percent of 300, multiply 300 by 0.15 to get 45.

Summary & Key Takeaways

• Move the decimal one unit to the left to find 10 percent and two units to the left for 1 percent of a number.

• To find 20 percent, double the value of 10 percent, and for 30 percent, triple it.

• Break down percentages into smaller parts, like 5 percent and 15 percent, and add them together to find the total percentage.