Lesson 3.83.8 · Part II
Start hereWords, worked example, and sentence starters
Learning target I can solve real-world problems by using unit rates to compare options.
Start hereWords for this lesson
Read each word before you begin. Say it out loud.
| Word | What it means | Example |
|---|---|---|
| Unit RateSpanish: Tasa unitaria | A rate for just 1 of something, like cost for 1 item. | $2.50 per pound means $2.50 for every 1 pound |
| Better BuySpanish: Mejor compra | The choice that costs less for each item. | $0.10 each vs $0.15 each — the $0.10 option is the better buy |
| ComparisonSpanish: Comparación | Looking at two or more amounts to see how they are related. | $3 per game < $4 per game |
| Per UnitSpanish: Por unidad | For each single item. | $0.50 per token means each token costs $0.50 |
| RateSpanish: Tasa | A ratio comparing two amounts with different units, like miles per hour. | 120 miles in 3 hours is a rate (miles and hours are different units) |
| ProportionSpanish: Proporción | A math sentence saying two ratios are equal. It helps find a missing number. | 5/3 = x/12 → x = 20 |
Say it and write itSentence starters
Finish each sentence out loud with a partner. Then use them in your writing.
Word bank Unit RateBetter BuyComparisonPer UnitRateProportion
Watch outA common mistake
A common mistake in Solve Problems with Unit Rates is comparing the total prices instead of the cost per item — the deal with the smaller total can still cost more per unit. Always reduce each option to its unit rate before you decide, then pick the lower one.
Lesson 3.83.8 · Part II
Apply Day · Version ASupported practice
Learning target I can solve real-world problems by using unit rates to compare options.
-
1Complete each step, then write the final answer.
6 apples cost $3. What is the cost for 1 apple?
Show your workHint Divide the price by the number of apples: $3 ÷ 6.
Final answer: -
2Complete each step, then write the final answer.
Shop A sells 2 pens for $3. Shop B sells 5 pens for $6. Which shop has the lower cost for 1 pen?
Show your workHint Find the cost for 1 pen at each shop. Then compare.
Final answer: -
3Complete each step, then write the final answer.
A pack of 10 tokens costs $2. What is the cost for 1 token?
Show your workHint Divide the price by the number of tokens: $2 ÷ 10.
Final answer:
Lesson 3.83.8 · Part II
Apply Day · Version BCore practice
Learning target I can solve real-world problems by using unit rates to compare options.
-
1Complete each step, then write the final answer.
Jada says 3 shirts for $24 is a better buy than 5 shirts for $35, because $24 is less. Is she right? What is the lower cost for 1 shirt?
Show your workFinal answer: -
2Complete each step, then write the final answer.
A 15-pack of water bottles costs $4.50. What is the cost for 1 bottle?
Show your workFinal answer: -
3Complete each step, then write the final answer.
A pack of 8 markers costs $6. What is the cost for 1 marker?
Show your workFinal answer:
Lesson 3.83.8 · Part II
Apply Day · ChallengeExtension
Learning target I can solve real-world problems by using unit rates to compare options.
-
1Circle the letter of the best answer. Show how you know.
A store sells 8 notebooks for $20. At the same unit price, what is the cost of 14 notebooks?
- A$26.00
- B$28.00
- C$35.00
- D$40.00
Show your work -
2Complete each step, then write the final answer.
Tray A costs $12 and feeds 4 people. Tray B costs $21 and feeds 6 people. Tom says Tray B is the better deal because it feeds more people. What is the lower cost per person?
Show your workFinal answer: -
3Complete each step, then write the final answer.
A 24-pack of batteries costs $15.60. What is the cost for 1 battery?
Show your workFinal answer: