Solved examples: Finding the missing part, whole, or percent.

🧮 Quick Study Guide

• 🧩 Percent: A percent is a ratio that compares a number to 100. It represents a part of a whole.
• ➗ Finding the Part: To find the part when given the whole and the percent, use the formula: $Part = Percent \times Whole$. Remember to convert the percent to a decimal before multiplying.
• ➕ Finding the Whole: To find the whole when given the part and the percent, use the formula: $Whole = \frac{Part}{Percent}$. Again, convert the percent to a decimal.
• 💯 Finding the Percent: To find the percent when given the part and the whole, use the formula: $Percent = \frac{Part}{Whole} \times 100$. The result is a percentage.
• 💡 Tip: 'Of' usually indicates multiplication, and 'is' usually indicates equals. This can help translate word problems into equations!

✍️ Practice Quiz

1. What is 20% of 80?
   1. 4
   2. 8
   3. 16
   4. 24
2. 15 is 30% of what number?
   1. 30
   2. 40
   3. 50
   4. 60
3. What percent of 50 is 10?
   1. 5%
   2. 10%
   3. 20%
   4. 50%
4. If 40% of a number is 28, what is the number?
   1. 50
   2. 60
   3. 70
   4. 80
5. What is 75% of 120?
   1. 60
   2. 70
   3. 80
   4. 90
6. 24 is what percent of 80?
   1. 20%
   2. 30%
   3. 40%
   4. 50%
7. 35 is 50% of what number?
   1. 50
   2. 60
   3. 70
   4. 80