What is a Percent?
A percent is a way of expressing a number as a part of 100. The symbol for percent is %.
For example: 25% means 25 out of 100, or 25 ÷ 100 = 0.25
25%
Quick Conversion Tip
To drop the percent sign, move the decimal 2 digits to the left.
45%
→
0.45
(Move decimal 2 places left)
8%
→
0.08
(Add zero as placeholder)
150%
→
1.50
(More than 100% = greater than 1)
Common Percents to Remember
25%
25%
1/4 = 0.25
50%
50%
1/2 = 0.5
75%
75%
3/4 = 0.75
100%
100%
1 (a whole)
📊 Percentage Quiz Challenge
Test your skills with these practice problems!
📝 How to Solve Percentage Problems
Before you start the quiz, let's learn how to calculate percentages! Here are three easy methods:
Method 1: Convert to Decimal
Example: What is 15% of 30?
- Convert the percentage to a decimal: \( 15\% = 0.15 \)
- Multiply by the number: \( 0.15 \times 30 = 4.5 \)
- Answer: \( 4.5 \)
Method 2: Use Fractions
Example: What is 25% of 80?
- Convert percentage to fraction: \( 25\% = \frac{25}{100} \)
- Multiply: \( \frac{25}{100} \times 80 = \frac{25 \times 80}{100} = \frac{2000}{100} = 20 \)
- Answer: \( 20 \)
Method 3: Mental Math Shortcuts
- 10%: Move decimal point one place left (10% of 50 = 5)
- 20%: Find 10% and double it (20% of 50 = 10)
- 25%: Divide by 4 (25% of 80 = 20)
- 50%: Divide by 2 (50% of 60 = 30)
💡 Remember the Formula:
\( \text{Percentage of a number} = \frac{\text{Percentage}}{100} \times \text{Number} \)
Question 1
What is 15% of 30?
Question 2
What is 25% of 80?
Question 3
What is 40% of 150?
Question 4
What is 75% of 60?
Question 5
What is 20% of 250?