Definition: A percent is a ratio that compares a number to 100, written with the symbol %, so 37% means 37 out of every 100.
What does percent mean?
The word percent means per hundred. A score of 37% means 37 for every 100. As a fraction it is 37/100, and as a decimal it is 0.37.
How do you find a percent of a number?
Change the percent to a decimal or fraction, then multiply. To find 35% of 80, multiply 0.35 by 80. The product is 28. You can also think in tens: 10% of 80 is 8, so 30% is 24, and 5% is 4, giving 24 plus 4, which equals 28.
How do you find the whole or the percent?
Use a part, whole, and percent relationship:
- Part = percent times whole.
- Whole = part divided by percent.
- Percent = part divided by whole.
If 18 is 45% of a number, the number is 18 divided by 0.45, which is 40.
What mistake is common?
Percents above 100 are allowed. If a plant grows to 150% of its original height of 12 inches, it is now 18 inches tall, not shorter.
Example: Mathbot has finished 21 of 60 levels, so he has completed 35 percent.