How many tenths are in 2.7?

27

There are 10 tenths in 1, so there are 2.7 x 10 = 27 tenths in 2.7

Alternatively, to divide by a fraction, invert the fraction and multiply:

2.7 / (1/10) = 2.7 X (10/1)

= 2.7 x 10

= 27