📚 Finding X% of a Number
To find a percentage of a number, convert the percentage to a decimal and multiply.
X% of Y = (X ÷ 100) × Y
Example: What is 20% of 150?
1
Convert 20% to decimal: 20 ÷ 100 = 0.20
2
Multiply: 0.20 × 150 = 30
Quick Mental Math Trick:
To find 10% of any number, just move the decimal point one place left.
10% of 250 = 25
Then for 20%, just double it: 20% of 250 = 50
🎯 Try It Yourself
Try It Yourself
What is 25% of 200?
25% = 0.25, so multiply 0.25 × 200
Try It Yourself
What is 15% of 80?
10% of 80 = 8, 5% = 4, so 15% = 8 + 4
📝 Final Quiz
0 / 3
Test what you learned. Pick the correct answer for each question.
1. What is 20% of 250?
Explanation:
(20 × 250) ÷ 100 = 50.
2. What is 15% of 80?
Explanation:
(15 × 80) ÷ 100 = 12.
3. Tip is 18%. The bill is $50. How much is the tip?
Explanation:
0.18 × 50 = $9.
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