Question

how to write 0.4 & 0.0009 in words​

Answer 1

Answer:

The number 0.4 written in english words is "four tenths".

nine ten-thousandths

or, simpler:

zero point zero zero zero nine

Answer 2

Answer:

$zero \: point \: four \\ \\ zero \: point \: zero \: zero \: zero \: nine$

hope it helps you ☺ ✌