V K Raman and S N Sharma Solutions for Exercise 4: CONCEPT REVISION TEST-3

The prime factorisation of a natural number is unique.

Half of $2^{10}$ is $2^5$.

The LCM of  $27, 36$ and $54$ is $54$.  .

$\frac{1}{5}$ and $\frac{5}{10}$ are like fractions. 

 Sum of two odd prime numbers is always _____ .

If $\frac{72}{198}=\frac{k}{11}$ then $k=$ _____.

If the LCM of $2^3, 2^2\times 3, 2\times 3^2$ in exponential form is $2^a\times 3^b$ then find $a+b$.

_____

 The product of two numbers is $640$. If the HCF is $16$ then the LCM is _____ .