Respuesta :

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.004 = 4 / 1000
and 3.42 = 342/100

All you have to do is look at the place that it's in and write the number on top

Ex. 0.004 is in the thousandths place    4/1000
Ex. 3.42 is in the hundredths place      342/100 or 3 42/100

Hope This Helps! :)