HCF of 12 and 18 is:
  • 2
  • 3
  • 6
  • 12
LCM of 4 and 6 is:
  • 10
  • 12
  • 18
  • 24
Which number is divisible by both 2 and 3?
  • 14
  • 18
  • 25
  • 35
The prime factors of 36 are:
  • 2 and 3
  • 2 and 6
  • 3 and 6
  • 4 and 9
Which of the following is not a prime number?
  • 31
  • 37
  • 41
  • 51
The product of two co-prime numbers is 35. One number is 5. The other number is:
  • 6
  • 7
  • 8
  • 10
Which number has the greatest number of factors?
  • 12
  • 13
  • 17
  • 19
A common factor of 18 and 24 is:
  • 5
  • 7
  • 6
  • 11
Which of the following is a prime factorization of 30?
  • 2 × 3 × 5
  • 2 × 15
  • 3 × 10
  • 5 × 6
The LCM of two co-prime numbers is:
  • 1
  • Their sum
  • Their product
  • Their difference
Which statement is true?
  • Every even number is prime
  • 2 is the only even prime number
  • 1 is a prime number
  • All odd numbers are prime
If a number is a multiple of both 4 and 6, which of the following must it also be a multiple of?
  • 8
  • 10
  • 12
  • 24
Which of these numbers has exactly 3 factors?
  • 4
  • 6
  • 8
  • 10
A number leaves remainder 1 when divided by 2, 3, and 4. What is the smallest such positive number?
  • 12
  • 13
  • 25
  • 37
Two friends clap together every 20 seconds and 30 seconds respectively. After how many seconds will they clap together again?
  • 40
  • 50
  • 60
  • 120
How many even prime numbers exist?
  • 0
  • 1
  • 2
  • Infinitely many
A number is divisible by 9 and 10. Which one of the following must it also be divisible by?
  • 18
  • 45
  • 90
  • 100
Which of these pairs are co-prime?
  • 14 and 21
  • 8 and 15
  • 12 and 18
  • 20 and 45
When 28 is divided by one of its factors, the quotient is 7. Which factor was used?
  • 2
  • 3
  • 4
  • 5
A number has exactly 8 factors. Which of these could be the number?
  • 18
  • 20
  • 30
  • 49
The smallest 4-digit number divisible by 6 and 8 is —
  • 1000
  • 1008
  • 1016
  • 1020
Which of the following is a factor of 84 but not a factor of 42?
  • 7
  • 14
  • 21
  • 28
Which of these numbers cannot be written as a product of two co-prime integers greater than 1?
  • 10
  • 16
  • 15
  • 21
The sum of all factors of 10 is —
  • 14
  • 15
  • 16
  • 18
Find the least number which when divided by 5, 6 and 8 leaves remainder 2 in each case.
  • 60
  • 62
  • 122
  • 242
If p is a prime number, which of the following is always true?
  • p has exactly 2 factors
  • p is odd
  • p is divisible by 3
  • p is a factor of all numbers
Which of the following numbers is a prime number?
  • 15
  • 21
  • 13
  • 25
Which of the following numbers is composite?
  • 2
  • 3
  • 7
  • 9
Prime factorization of 20 is:
  • 2 × 2 × 5
  • 4 × 5
  • 2 × 10
  • 1 × 20
Which of the following numbers is divisible by 2?
  • 35
  • 27
  • 48
  • 19
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