sometimes true
A rhombus is a quadrilateral, but all quadrilaterals are not rhombus'. So sometimes would be your answer.
Sometimes true. The LCM of 4 and 9 is 36. The LCM of 4 and 8 is 8.
The statement is false. if any or both of numbers are less than 1, the product is less than the greater (or both) of the numbers. Eg. 1/2 x 1/3 = 1/6 ; 1/6 < 1/2 and 1/6 < 1/3
infinity
The product of two odd numbers is never even.
The product of any two numbers, neither of which is 1, is never a prime number.
The product of two prime numbers is always a composite number, and it never is a prime number.
Sometimes true. (when the numbers are mutually prime) e.g. it's true for 5 and 7, 8 and 3. But it's not true when they have a factor in common e.g. 6 and 8, or 15 and 20.
yes
False.
No, the product of two positive mixed numbers can never be less than one.
Sometimes true.