The greatest common divisor of 15,25,75!

and 90 is ?!

!

3*5*15*90*

All the following numbers save one are!

prime numbers. The only number!

that is not prime is ?!

41*51*61*71*

Which one of the following numbers!

would be the L.C.M of 3,9 and 18 ?!

!

9*18*27*36*

The H.C.F of 12 and 42 is ?!

!

!

2*3*6*8*

Consider the sequence of numbers!

7,11,15,19,23,27,31. How many of these!

are prime numbers ?!

4*5*6*7*

Consider the numbers!

12,24,36,56,63,66,72,86,96. How many of these!

numbers are multiples of 6?!

5*6*7*8*

The L.C.M of 9,18,27,36 and 45 is ?!

!

!

9*180*270*540*

One of the following is a factor of the other!

in the same pair. Which pair ?!

!

17 and 86*17 and 117*32 and 160*32 and 191*

One of the numbers is a factor of the other!

in one of the following pairs of numbers.!

Which one ?!

15 and 50*16 and 52*17 and 51*18 and 56*

How many prime numbers are there between 10 and 20 ?!

!

!

2*3*4*5*


