HCF and LCM Facts

The HCF of two or more numbers is always smaller than or equal to the highest number.

• True

• False

The LCM of two or more numbers is always smaller than or equal to the largest number.

• True

• False

The LCM of two prime numbers is always equal to their product.

• True

• False

The HCF of two numbers is the largest number that divides both of them without leaving a remainder ( a factor of both).

• True

• False

When using prime factorization, the LCM of two or more numbers is the product of all the prime factors they have in common.

• True

• False

When using prime factorization, the HCF of two or more numbers is the the product of the highest power of each prime factor.

• True

• False

Ben exercises every 12 days and Isabel every 8 days. Ben and Isabel both exercised today. How many days will it be until they exercise together again?

• 4

• 6

• 12

• 24

A prime number is...

• a number that has only one factor.
• a number that has at least two factors.
• a number that has more than two factors.
• a number that has only two factors.
  (1 and itself)

2 is the only even prime number

• True

• False