# Divisors

Pro Problems > Math > Number and Quantity > Number Theory > Divisors# Featured Pro Problems

Greatest common factor and least common multiple problem

Find a number, given its LCM and GCF with another integer

Determine how many stairs the staircase has, based on what happens when people leap up the stairs

Find how many multiples of two and three there are between two integers

Find how many integers are multiples of two and three, but not six.

Find the pattern. Study the list of numbers, and figure out what number is missing, and why

A problem involving dividing donuts evenly among a group of people

Factor the following number without use of your calculator

# Full Directory Listing

Divisor Count, Donut Division, Find the Missing Number, GCF and LCM, LCM and GCF, Leaping up the Obelisk, Multiples of Two and Three, No-Calculator Factoring, Two, Three, but not Six# Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

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