Proper Patterns
Given some of the proper factors of a number, what could the number be?
Author Archive for: corrill
Entries by InterMath
Partial Sum of Consecutive Integers
Can a partial sum of consecutive positive integers equal a number with identical digits?
Hypatia’s Triumph
Take on the Egyptian Hypatia’s challenge about sums of squares.
Double Trouble
Find a number that fits this description.
Sum of Infinite Fractions
Determine the sum of an infinite geometric series that begins with the number one.
The Frog Race
Two frogs have a race. Determine which frog wins the race.
Perfecting 90
How can 90 become a perfect square? a perfect cube?
Three Daughters
Determine the age of each daughter.
Multiples of 72
What is the relationship between two divisors and their product, sum, difference, and quotient?
Choose an Elevator
Determine which of two elevators reaches the lobby first.