0.7 is read as "seven tenths" since the 7 is in the tenths column.
We read it as that, since this is equal to the fraction [tex]\dfrac{7}{10}[/tex].
0.007 would be "seven hundredth" since the 7 is in the hundredths column.
We read it as that, since this is equal to the fraction [tex]\dfrac{7}{100}[/tex].
