How can you write 0.40 in simplest form as a fraction?

Answer 1

0.40 =

0.40/ 1.00

Cancel down by '10'

0.4/1.0

Cancel down the decimal point

04/10

The 'zero' to the left of '4' is trivial, 'drop it'.

Hence

4/10

Cancel down by '2'

2/5

The fraction in its simplest form .

Answer 2

.4 or 0.4

there is no need for the 0 at the end

0.4 = 4/10 = 2/5 in its simplest form as a fraction.