Question

is 10/25 equivalent to 0.4

Answer 1

Yes,
10/25 = .4
So, 10/25 is equivalent to .4

Answer 2

Yes.

First, you have to make denominator equal to 100. so if you multiply 10/25 by 4, you'll get 40/100. there's two zeros in the denominator, so you have to move the decimal twice to the left ( 40. => .4 ) and it equals 0.4 so you're right.

I can't speak English fluently,.. sorry about that, but I hope you understand:)