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Which expression has an estimated product of 45?

A. [tex]$44.7 \times 2.1$[/tex]

B. [tex]$7.5 \times 8.4$[/tex]

C. [tex]$8.7 \times 5.28$[/tex]

D. [tex]$38.1 \times 7.3$[/tex]

Answer :

To determine which expression has an estimated product of 45, we can look at each option and see which one rounds to 45.

Here are the expressions and their estimated products:

1. [tex]\(44.7 \times 2.1\)[/tex]:
- The exact product is roughly 94.
- This number rounds far from 45.

2. [tex]\(7.5 \times 8.4\)[/tex]:
- The exact product is roughly 63.
- This number rounds to a value much higher than 45.

3. [tex]\(8.7 \times 5.28\)[/tex]:
- The exact product is roughly 46.
- This number is very close to 45, rounding to approximately 46, which is about as close to 45 as we get.

4. [tex]\(38.1 \times 7.3\)[/tex]:
- The exact product is roughly 278.
- This number is much higher than 45.

From this analysis, the expression [tex]\(8.7 \times 5.28\)[/tex] has a product that is closest to 45, making it the best estimate.

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