Make a chart. KHDBdcm
That is Kilo Hecto Deka Base deci centi milli
put the number 1.89 with the 1 under the Liter (Base)
Move the decimal to the desired location which in this case is milli.
1.89L=1890mL
That is 3.75 ml.
1900 ml
That is 4,250 ml.
That is 600,000 ml.
That is 12,000 ml.
That is 4,000,000 ml.
That is 3,000,000 ml
That is 839,000 ml.
That is 3,070 ml
10
5
That is 47,000 ml,