1. Ratio & Unit Rate
Pre-Algebra
Glencoe 9.1

2. A ratio is a comparison of two numbers or measures using division.
A ratio can be written three ways:
3:5 3/ to 5
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3. Ratios are often expressed as fractions in simplest or as a decimal.
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4. What ratios can we form from the tiles above?
A ratio is the comparison of two numbers with the same units by division. A ratio may be written in three ways.
What ratios can we form from the tiles above?
12 to 8
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5. Create as many ratios as possible
Create as many ratios as possible. Write each ratio three different ways.
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6. Simplest Form
Write the ratio 50 to 300 in simplest form.
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7. Simplest Form
Write the ratio 60¢ per dozen in simplest form.
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8. Look over the ratios you have written
Look over the ratios you have written. Is there another way that you can write those ratios?
The ratio illustrated here is four filled cells to ten total cells.
The ratio shown here is two filled cells to five total cells.
What do you know about these two ratios? How can you prove your answer?
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9. Unit Rate “How much for just 1?”
To find the Unit Rate, you would find the cost or amount for 1. Or the rate when the denominator is 1.
“How much for just 1?”
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10. Unit Rate If it costs $78 for 13 sandwiches, What is the unit rate?
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11. The cost of a 12-ounce box of Cheerios is $3. 29
The cost of a 12-ounce box of Cheerios is $3.29. Publix brand Cheerios cost $4.89 for an 18-ounce box. Find the unit rate to find the better buy.
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12. Mile per Gallon
M.P.G. stands for miles per gallon and is usually used for gas mileage in cars.
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13. Unit Rate
If it takes 11 gallons to drive 250 miles, What is the unit rate or m.p.g.?
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14. Solving Word Problems X=22.7 mpg Write problem as proportions:
Solve using cross multiplication.
X=22.7 mpg
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15. Now you try it!
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