Mr. Johnson buys 5 bottles of lemonade for the school picnic. He buys four 28- ounce bottles and one 64-ounce bottle. Using rounding to the nearest ten, about how much lemonade does Mr. Johnson buy in all?
The correct answer and explanation is:
Correct Answer: A. 180 ounces
Step-by-Step Explanation:
Mr. Johnson buys:
- Four bottles, each with 28 ounces
- One bottle with 64 ounces
Let’s calculate the total exact amount first:
Four 28-ounce bottles: 4×28=112 ounces4 \times 28 = 112 \text{ ounces}
Add the 64-ounce bottle: 112+64=176 ounces112 + 64 = 176 \text{ ounces}
Now, the question asks you to round to the nearest ten.
176 rounded to the nearest ten is:
- Look at the units digit (the “6” in 176).
- Since it is 5 or more, we round up.
176≈180 ounces176 \approx \boxed{180} \text{ ounces}
Why This is the Correct Answer:
Rounding to the nearest ten is a method of estimation that simplifies numbers for quick mental math or planning. In this case, Mr. Johnson needs a rough idea of how much lemonade he’s bringing.
- 28 rounds to 30, and 64 rounds to 60. You could also estimate using:
- 4×30=1204 \times 30 = 120
- 120+60=180120 + 60 = 180 ounces
This confirms the answer from another estimation method.
- Rounding is useful in everyday situations like shopping or cooking where exact precision is less important than quick planning.
- Among the options:
- A. 180 ounces is the rounded value of 176
- B. 180 ounces (same as A)
- C. 90 ounces is far too low
- D. 190 ounces is too high since 176 is closer to 180
Conclusion:
By adding the exact values and rounding to the nearest ten, we find that Mr. Johnson buys about 180 ounces of lemonade. Thus, the correct answer is:
✅ A. 180 ounces