Ravi wrote two digits of a 3- digit number on the black board as shown below.
And the missing digit is ______ if the number has 11 and 13 as factors?
2
4
6
8
Find the sum of first three multiples of 5.
15
20
30
35
The sum of prime numbers between 20 and 30 is:
50
23
52
51
The smallest even prime number is
Find a number which is a multiple of all the numbers from 1 to 10?
5040
1260
720
1440
The sum of the least prime number and the least composite number is:
1
LCM of 6, 12 and 18 is:
18
36
24
72
LCM of 15, 30 is:
5
450
The factor of the number shown on the spike abacus is:
7
9
Number of multiples of 9, which is less than 50
