The problem asks us to estimate the number 51,556,742. First, we choose the best estimate from the options provided: 5,000,000, 50,000,000, 6,000,000, and 60,000,000. Then, we need to write our estimate as a product of a 1-digit number and an integer power of 10.

1. Problem Description

The problem asks us to estimate the number 51,556,

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2. First, we choose the best estimate from the options provided: 5,000,000, 50,000,000, 6,000,000, and 60,000,

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0

0. Then, we need to write our estimate as a product of a 1-digit number and an integer power of

1

0.

2. Solution Steps

The number 51,556,742 is closer to 50,000,000 than to 60,000,

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0

0. So the best estimate is 50,000,

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0.

Now we need to express 50,000,000 as a product of a single-digit number and a power of

1

0. We can write 50,000,000 as $5 \times 10,000,000$.

Since $10,000,000 = 10^7$, we can write $50,000,000 = 5 \times 10^7$.

3. Final Answer

The best estimate is 50,000,

0

0

0. $51,556,742 \approx 5 \times 10^7$