Numbers Quiz | MCQs

Co-prime numbers have only 1 as their common divisor. In the given number sets 8 and 10 have 2 as a common divisor.

The sequence 1, 2, 3, 4, 5, ... represents the Natural Numbers (also called counting numbers), which are the numbers used for counting and do not include 0 or negative numbers.

The first three prime numbers are 2, 3, and 5. Their sum is: 2 + 3 + 5 = 10.

Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56…...

Twin primes are pairs of prime numbers that differ by exactly 2. The pair (5, 7) satisfies this condition. The other pairs either do not consist of prime numbers or do not differ by 2.

Co-prime numbers have only 1 as their common divisor. 8 and 15 have no common factors other than 1, making them co-prime. The other pairs have common factors greater than 1.

8, 12 and 18 are factors of 72 while 16 is not.

A composite number has more than two factors. The number 36 has multiple factors (1, 2, 3, 4, 6, 9, 12, 18, and 36), making it a composite number. The other options (11, 23, and 29) are prime numbers, as they have only two factors: 1 and themselves.

91 is divisible by 7 and 13

The prime factorisation of 48 is 2 x 2 x 2 x 2 x 3