Main Idea and New Vocabulary

Example 1:Real-World Example

Example 2:Real-World Example

Example 3:Real-World Example

• Determine unit rates.

• rate

• unit rate

Manuel reads 1,000 words in 5 minutes. Write this rate as a unit rate.

Write the rate that compares the number of words to the number of minutes. Then divide.

=1,000 words5 minutes

______________ 200 words1 minute

_____________

÷5

÷5

Answer: So, the unit rate is

Mrs. Thomas paid $180 for 30 people to visit the science museum. Write this rate as a unit rate.

A. $6 per person

B. $8 per person

C. $9 per person

D. $18 per person

WAGES Imena earned $216 last week. If she worked 18 hours, how much was she paid per hour?

Write the rate that compares the amount earned to the number of hours worked. Then divide.

=$21618 hours

___________

1 hour__________$12

÷18

÷18

Answer: So, Imena was paid $12 per hour.

UNIT PRICES Michael bought a 6-pack of pudding cups for $4.50. How much did he pay per pudding cup?

A. $0.27 per pudding cup

B. $0.54 per pudding cup

C. $0.75 per pudding cup

D. $1.33 per pudding cup

HEART RATES A cat’s heart beats about 3,600 beats every 30 minutes. A horse’s heart beats about 1,320 times every 30 minutes. How many more beats does a cat’s heart beat in 60 minutes than a horse’s heart?

Step 1 Find the unit rates.

A horse’s heart beats about

A cat’s heart beats about

Answer: So, a cat’s heart beats 4,560 more times in

60 minutes than a horse’s heart.

Step 2 Using the unit rate for each, determine thenumber of beats in 60 minutes.

A cat’s heart beats 120 × 60 or 7,200 beatsin 60 minutes. A horse’s heart beats 44 × 60 or 2,640 beats in 60 minutes.

Step 3 Find the difference.

7,200 – 2,640 = 4,560

UNIT PRICES Gabriela paid $2.59 for a 7-ounce bag of chips. Jeremy paid $4.20 for a 12-ounce bag of chips. How much more per ounce did Gabriela pay?

A. Gabriela paid $0.02 more per ounce.

B. Gabriela paid $0.20 more per ounce.

C. Gabriela paid $0.32 more per ounce.

D. Gabriela paid $1.61 more per ounce.