A1. Which statement is incorrect?

(A) A non-zero fraction has a negative value if the numerator and denominator have different signs.

(B) The product of an even and an odd number is an even number.

(C) The number $5 m$ is a multiple of the number $m$.

(D) The value of the power of a negative number is positive if the exponent is an even number.

(E) If a number is divisible by 2, it is definitely divisible by 10.
A1. Incorrect is the statement (E), as a number divisible by 2 is not necessarily divisible by 10.