Question

Which number is a ration number when multiplied by 0.25?

A. 0.45
B. -squard root of 15
C. Pie
D. 0.53713218

Answer 1

A,D

Explanation:

A rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.

Product of two rational numbers is always rational.

Product of two irrational numbers may or may not be rational.

Product of a rational number and a irrational number is rational if the rational number is zero.

option A:

Both
`0.25` and
`0.45` are rational,So their product is also rational.

option B:

`0.25` is irrational but
`-√(15)` is irrational,So their product is also irrational.

option C:

`0.25` is irrational but
`\pi` is irrational,So their product is also irrational.

option D:

Both
`0.25` and
`0.53713218` are rational,So their product is also rational.