2/5 and 10/25 are the same identical amount, written in different ways.
As a decimal, both are 0.4 .
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Divide by 100. 25% is the same as 0.25.
Multiply the decimal value by 100. For example, 0.25 becomes 0.25 x 100 = 25 %
10 over 25 reduces to 2/5, which is the same as 2 ÷ 5, which equals 0.4
To find what 10/25 is as a decimal, divide the numerator by the denominator. 10 divided by 25 is 0.4
0.40