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- 1. Nitrogen makes up 78 percent of the air. Oxygen, the gas that is most important for keeping you alive, makes up 21 percent. More than 70 percent of Earth’s crust is covered with water.
- 2. • To write a PERCENT as a DECIMAL. • Change the percent to fraction with a denominator of 100. then, divide the NUMERATOR by the DENOMINATOR.
- 3. • Another way to write a percent as decimal is to move the decimal point two (2) places to the LEFT and drop the PERCENT (%) SIGN
- 4. • To write a fraction as percent, obtain an equivalent fraction whose denominator is 100. take the NUMERATOR and affix the percent sign.
- 5. • The common method to change a fraction to percent is to multiply the fraction by 100%
- 6. • Another way to write fraction as a percent is to convert the fraction to a decimal to a percent.
- 7. • The method is also used when converting mixed numbers to percents.
- 8. • A short way to write decimal to percent is to the decimal point two (2) places to the right and affix the % sign.
- 9. FINDING THE PERCENTAGE
- 10. Convert 5% to decimal then Multiply
- 11. FINDING THE BASE
- 12. Convert 15% to decimal then Divide
- 13. FINDING THE RATE
- 14. 12 is what percent of 40? CONVERT 0.30 TO PERCENT = 30%
- 15. • Percentages are an important part of our everyday lives. • Percentage is a very handy way of writing fractions. • Percentages can be compared more easily than fractions.

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