Hello from MrBillDoesMath!
Answer: The statement "25.8125 is irrational" is false
Discussion:
25.8125 = 25 + 0.8125 =
25 + 8125/1000 =
Multiply and divide 25 by 1000 and combine terms over a common denominator:
= 25000/1000 + 8125/ 1000
= 33125/1000
Divide numerator and denominator by 125 ( = 5^3):
= 265 / 8
which is a rational number.
Thank you,
MrB