A total of 7,803,100 tourist visited Country A from the year 2018 to the year 2020. Round to the nearest place value, then express this number in the form of a single digit times an integer power of 10.

Answer 1

To express the number 7,803,100 in scientific notation, we first round it to the nearest place value. Since we are working with significant figures, let's round 7,803,100 to the nearest ten million.

The number is 7,803,100. The ten million place is the first digit (7), and the digit next to it (8) indicates that we round up. Therefore, rounding to the nearest ten million gives us 8,000,000.

Next, we express 8,000,000 in scientific notation. The number can be written as:

\[ 8,000,000 = 8 \times 10^6 \]

Thus, the rounded number is \( 8 \times 10^6 \).