2/5 x 2.5 = ?????????

I assume this statement "2/5 x 2.5" means
(2/5)*2.5
= (2/5)*(5/2)
= 1

If you mean 2/(5*2.5), then this is your answer:
2/[5*(5/2)]
= 2/(25/2)
= 2*(2/25)
= 4/25

Find what is it 2.5:
2 1/2 = 5/2
So:
2/5*5/2
Let us use the rule for multiplying fractions:
(2*5)/(5*2)
Let us reduce the expression:
1

The final answer is 1.

6 1/4

First divide 2/5, then take that answer and multiply it by 2.5, will give you 6.25 or 6 1/4

2/5 x 2.5
= (2 x 2.5)/5
= 5/5
= 1

2/5=0.4

0.4 x 2.5= 1

2/5 = 0.4
0.4 * 2.5 =1

2/5 x 2.5=one whole

2/5 x 5/2=1

1

1