The Greatest Common Divisor $(GCD)$ of $13, 23,$ and $31$ is .......

Find the largest number which divides $615$ and $963$ leaving remainder $6$ in each case.

On a morning walk,three persons step off together and their steps measure $40\, cm$,$42\, cm$ and $45\, cm$,respectively. What is the minimum distance each should walk so that each can cover the same distance in complete steps? (in $cm$)

Find the $\text{g.c.d.}$ and $\text{l.c.m.}$ of $510$ and $92$ using the fundamental theorem of arithmetic.

If $HCF(a, b) = 8$,$LCM(a, b) = 64$ and $a > b$,then $a = \dots$

If the Least Common Multiple $(LCM)$ of two numbers is equal to their product,then their Greatest Common Divisor $(GCD)$ is ........ .