A total of 7,803,100 tourists 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 integer power off 10.
To round 7,803,100 to the nearest place value, we look at the digit in the hundred thousands place, which is 0. Since it is less than 5, we round down to 7,800,000.
To express this number in the form of a single digit times an integer power of 10, we can write it as 7.8 × 10^6.