The sum of prime numbers between 20 and 30 is:
50
23
52
51
LCM of 15, 30 is:
15
30
5
450
From the given data the number of prime numbers between 20 and 30 is:
0
2
3
4
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?
6
8
________ should be added to 695 to make it divisible by 10.
1
The sum of the least prime number and the least composite number is:
21 and 31 are _________ numbers.
Prime
Composite
Co- prime
Twin prime
Number of multiples of 9, which is less than 50?
7
_________ should subtracted from 642 to make it divisible by 8.
642
Find the sum of first three multiples of 5.
20
35
