What is 0.09 0.9 0.19 and 0.019 in order from least to greatest?

To order these numbers from least to greatest, we need to compare the place values of the digits after the decimal point. The numbers are 0.019, 0.09, 0.19, and 0.9. When comparing these numbers, 0.019 is the smallest because its hundredth place is the smallest. Next is 0.09, as it has a larger tenths place. Then comes 0.19 with a larger tenths place than 0.09. Finally, 0.9 is the largest as it has a whole number in the tenths place.