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The question is asking for two things:
1. **The best way to estimate** the number of roses needed for 24 centerpieces using compatible numbers.
2. **The exact number of roses** required for 24 centerpieces.

Given:
- Each centerpiece contains **18 roses**.
- The florist is making **24 centerpieces**.

### Exact Calculation:
To calculate the exact number of roses:
\[
18 \, \text{roses/centerpiece} \times 24 \, \text{centerpieces} = 432 \, \text{roses}
\]
Thus, the exact number of roses is **432**.

### Estimation Using Compatible Numbers:
Compatible numbers are numbers that are easier to work with mentally. To estimate:
- We can round **18** to **20**, and
- Keep **24** as **25**, as this makes multiplication simpler.

So, an estimation would be:
\[
20 \, \text{roses/centerpiece} \times 25 \, \text{centerpieces} = 500
\]
Thus, the best estimate would be **500** roses.

### Answer:
Option **B** (20 × 25 = 500; 432) is the correct choice. The estimate is **500** roses, and the exact number is **432** roses.

Would you like more details on this or have any questions?

#### Further Questions:
1. Why is rounding 18 to 20 a good estimation technique here?
2. How does estimating help in real-life scenarios like this?
3. What other compatible numbers could you use for this problem?
4. How can you verify your estimation without doing the exact calculation?
5. Why is it useful to know both the estimate and the exact value in situations like this?

#### Tip:
When estimating, choose numbers that are close to the original values but easier to compute mentally, especially multiples of 10 or 5.

A florist makes centerpieces. He puts 18 roses in each centerpiece. Which is the best way to use compatible numbers to estimate the number of roses the florist needs for 24 centerpieces? What is the exact number of roses?

Learn how to estimate and calculate the exact number of roses a florist needs for 24 centerpieces, each with 18 roses. This problem covers the concepts of estimation using compatible numbers and basic multiplication, ideal for students in Grades 4-5.

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