2.13× blank = 21,300,000 what power of 10 would make this equation true

Answer 1

2.13x = 21,300,000
x = 21,300,000/2.13 = 10,000,000 = 10^7

Answer 2

Another way of doing this is to start at the decimal point and count how many digits you must move the decimal point to get to the end. That is 7 so it's 2.13E7