1.09 < 1.19 < 1.9 < 1.901 ;
The easiest way to do this is to write the decimals with equal amount of places after the dot and you'll see it more clearly:
1.09 = 1.090 1.901 = 1.901 1.9 = 1.900 1.19 = 1.190
So from the least to the greatest:
1.090 1.190 1.900 1.901
In a form you gave at the beginning:
1.09 < 1.19 < 1.9 < 1.901
The decimals in order from least to greatest are 1.09, 1.19, 1.9, and 1.901. This comparison involves aligning the numbers correctly and assessing their values. The smallest decimal is 1.09, increasing to the largest, 1.901.
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