Mastering Percentage Calculations: Mental Math Tricks and Multiplication Methods

Explore mental math tricks and multiplication methods to easily find percentages of numbers. Learn how to convert percents to fractions and use shortcuts for common percentages like 50%, 25%, 20%, 10%, 5%, and 1%. Discover the simple technique of multiplying decimals for accurate calculations. Practice finding various percentages of numbers with helpful hints and examples.

• Percentage Calculation
• Mental Math
• Multiplication Method
• Percent Fractions
• Decimal Multiplication

lsure Follow

Uploaded on Oct 02, 2024 | 0 Views

Download Presentation

Please find below an Image/Link to download the presentation.

The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.

Presentation Transcript

1. Finding a Percent of a Number Two methods: 1.) Mental Math- (Only works for some percents) 2.) Multiplication method

2. Mental Math Finding Percents 50% Write 50% as a fraction in lowest terms. Find 50% of 240. Find 50% of 150. Trick: To find 50% divide by 2.

3. Mental Math Finding Percents 25% Write 25% as a fraction in lowest terms. Find 25% of 240. Find 25% of 32. Trick: To find 25% divide by 4.

4. Mental Math Finding Percents 20% Write 20% as a fraction in lowest terms. Find 20% of 350. Find 20% of 40. To find 20% divide by 5. Trick:

5. Mental Math Finding Percents 10% Write 10% as a fraction in lowest terms. Find 25% of 240. Find 10% of 356. Find 10% of 50. To find 10% divide by 10. Trick:

6. Mental Math Finding Percents 5% Write 5% as a fraction in lowest terms. Find 25% of 240. Find 5% of 120. Find 5% of 80. To find 5% divide by 20. Trick:

7. Mental Math Finding Percents 1% Write 1% as a fraction in lowest terms. Find 25% of 240. Find 1% of 125. Find 1% of 70. To find 1% divide by 100. Trick:

8. Mental Math Finding Percents 33 % Write 33.3% as a fraction in lowest terms. Find 25% of 240. Find of 126. Find of 51. To find 33.3% divide by 3. Trick:

9. Percent Short cut 50% 25% 20% 10% 5% 1%

10. How could we find 15%? Find 15% of 60. Find 15% of 42 How could we find 75%? Find 75% of 400. Find 75% of 60

11. Hint- "of " means multiplication Method two: Multiplying decimals Convert the percent to a decimal and multiply 1.) Find 45% of 40 2.) Find 35% of 500 4.) Find 80% of 35 3.) What is 12% of 43?

12. Demonstrate Understanding: Find each percent, you may use either method. 1.) 20% of 95 2.) 52% of 96 3.) 15% of 82 4.) of 147 5.) 26% of 26 6.) 30% of 250 7.) There were 40 questions on the test, if Samantha got 80% correct, how many questions did she get right?