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Ratios and Rate

Ratios and Rate. Vocabulary. A ratio is a comparison of two quantities by division. Example 1:

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Ratios and Rate

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  1. Ratios and Rate

  2. Vocabulary • A ratio is a comparison of two quantities by division.

  3. Example 1: For lunch during the summer recreation program, the Youth Center orders 8 pepperoni pizzas out of every 10 pizzas that they order. What is the ratio of pepperoni pizzas to the total number purchased? Write a verbal model of what you are comparing. Substitute in the values given for each quantity, and simplify the fraction.

  4. Example 2: Last year, Andy’s hockey team had a record of 48 wins out of 64 games played. What was the ratio of wins to games played? Write a verbal model of what you are comparing. Substitute in the values given for each quantity, and simplify the fraction.

  5. Vocabulary • A rate is a special type of ratio comparing two quantities with different kinds of units. • Traveling 180 miles on 9 gallons of gas • $8.00 for 2 pounds of roast beef • A verbal model can help us write rates. • A unit rate is a rate that is simplified so that it has a denominator of 1 unit. • A unit rate compares a quantity to 1 unit of another quantity. • The speed limit on I-86 is 65 miles per hour. • NYS minimum wage is currently $7.25 per hour

  6. Example 3: On his trip to Pittsburgh, Alex drove 161 miles on 7 gallons of gas. What was his gas mileage on the trip in miles per gallon? Write a verbal model of what you are comparing. Substitute in the values given for each quantity. Since a unit rate has a denominator of 1 unit, divide the numerator and denominator by 7. Alex’s car got 23 miles per gallon on his trip.

  7. Example 4: Lola is painting her room. If ½ gallon of paint covers ⅙ of her walls, how much paint does she need for her entire room? Write a verbal model of what you are comparing. Substitute in the values given for each quantity. Divide the numerator and denominator by ⅙ to find the unit rate. Lola will need 3 gallons of paint for her room.

  8. Sometimes, we are asked to compare unit rates….. Example 5: During the holidays, Emily spends $12.50 for 2 pounds of fudge and $23.85 for 5 pounds of wrapped candy. Which item costs less per pound? By how much? Write a verbal model of what you are comparing. For the fudge, For the wrapped candy, The wrapped candy costs less by $1.48 per pound. To find the difference in price, subtract. $6.25 – $4.77 = $1.48.

  9. Example 6: At Euclid Middle School, of the thirty girls who tried out for the lacrosse team, 12 were selected and of the forty boys who tried out, 16 were selected. Are the ratios of number of students on the team to number of students trying out the same for both boys and girls? How do you know? Write a verbal model of what you are comparing. For the girls, For the boys, Yes, the ratios are the same. The value of each ratio is the same.

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