What are the numbers which have more than two factors called?
Numbers which have more than two factors are called composite numbers.
What are the numbers which have only two factors (1 and the number itself) called?
Numbers which have only two factors (1 and itself) are called prime numbers.
Which is the number that is neither prime nor composite?
Which of the following is the L.C.M. of 36 and 72?
The prime factorization of 36 is: 2 x 2 x 3 x 3
The prime factorization of 72 is: 2 x 2 x 2 x 3 x 3
Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get LCM = 2 x 2 x 2 x 3 x 3 = 72
What is the L.C.M. of 17 and 5?
What is the H.C.F. of 17 and 5?
No factor except 1 is common to them.
Give an example for twin primes.
The first few twin prime pairs are: (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), (71, 73), (101, 103), (107, 109), (137, 139), … ... Five is the only prime in two distinct pairs.
What is the H.C.F. of two co-prime numbers?
H.C.F. of two co-prime numbers is 1.
Which of the following is an example of an even number?
Of the given options 973572 is an even number.
What is the H.C.F. of 120, 144 and 216?
∴ H.C.F. of 120 & 144 =24
What do you get when you multiply two factors?
When two factors are multiplied we get a product.
Every number is a _____ and a _____ of itself.
What are the numbers which are multiples of 2 called?
What is the H.C.F. of the two numbers equal to?
Which of these numbers is a factor of every number?
1 is a factor of every number.
How many prime numbers are there between 1 and 50?
1 is not a prime number so these are all possible prime numbers between 1 to 50
“2,3,5,7,11,13,17,19,23,29,31,37,41,43,47” which are 15 in number
A is the 5th prime number. B is the 7th prime number. What is B - A?
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47
A = 11 and
B = 17
17-11 = 6
What is the number of prime numbers between 50 and 60?
53 and 59 are the prime number between 50 and 60
Which of the following is the prime factorisation of 140?
A: 2 × 2 × 7 = 28
B: 2 × 2 × 5 = 20
C: 2 × 2 × 5 × 7 = 140
D: 2 × 2 × 5 × 7 × 3 = 420
The successor of every even number is
Even numbers are 2,4,6,8,10 and so on.
In between these even numbers, we have odd numbers 3,5,7,9..
Hence, successor of even number, is an odd number.
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