percent grade 7 quiz

📚 Quick Study Guide

• ➕ Understanding Percent: A percent is a ratio that compares a number to 100. It represents a part of a whole.
• ➗ Converting Percent to Decimal: Divide the percent by 100. For example, 25% = 25/100 = 0.25.
• ✖️ Converting Decimal to Percent: Multiply the decimal by 100. For example, 0.6 = 0.6 * 100 = 60%.
• 📝 Finding the Percent of a Number: Multiply the number by the percent (in decimal form). For example, to find 20% of 50, calculate 0.20 * 50 = 10.
• 💲 Percent Increase/Decrease: Use the formula: $\frac{\text{New Value - Original Value}}{\text{Original Value}} \times 100$. If the result is positive, it's an increase; if negative, it's a decrease.
• 🧾 Sales Tax & Discounts: Sales tax is added to the original price. Discounts are subtracted from the original price. Both are calculated as a percentage of the original price.

🧪 Practice Quiz

1. What is 30% of 50?
1. 10
2. 15
3. 20
4. 25
2. Convert 0.75 to a percent.
1. 0.75%
2. 7.5%
3. 75%
4. 750%
3. What is 150% of 30?
1. 15
2. 30
3. 45
4. 60
4. If a shirt costs $20 and is on sale for 25% off, what is the sale price?
1. $5
2. $10
3. $15
4. $25
5. What percent of 80 is 20?
1. 10%
2. 20%
3. 25%
4. 40%
6. A store buys a toy for $8 and sells it for $12. What is the percent markup?
1. 25%
2. 33.3%
3. 50%
4. 75%
7. If the price of gas increased from $3.00 to $3.60, what is the percent increase?
1. 6%
2. 12%
3. 18%
4. 20%