Greatest Common Factor and Least Common Multiple

Math ⇒ Number and Operations

Greatest Common Factor and Least Common Multiple starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Greatest Common Factor and Least Common Multiple. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 7

A teacher wants to arrange 24 red pens and 36 blue pens in equal groups with no pens left over. What is the greatest number of pens that can be in each group?

Explain the difference between GCF and LCM.

Find the GCF of 100 and 250.

Find the GCF of 36, 60, and 84.

Find the GCF of 42, 56, and 70.

Find the GCF of 48 and 180.

Find the LCM of 14 and 20.

Find the LCM of 16 and 24.

Find the LCM of 18 and 30.

Find the LCM of 21 and 28.

Find the LCM of 5, 10, and 15.

Find the LCM of 9 and 12.

Find the least common multiple (LCM) of 8 and 12.

If the GCF of two numbers is 1, what are these numbers called?

If the GCF of two numbers is 12 and their product is 288, what is their LCM?

If the GCF of two numbers is 8 and their LCM is 120, what is the product of the two numbers?

If the LCM of two numbers is 60 and their GCF is 5, what could the two numbers be?

If the LCM of two numbers is 72 and one of the numbers is 8, what could the other number be?

Three bells ring at intervals of 4, 6, and 8 minutes. If they ring together at 8:00 am, at what time will they next ring together?

What is the greatest common factor (GCF) of 18 and 24?