Siblings
How old are the twins and their younger brother?
Author Archive for: corrill
Entries by InterMath
Prime Factor Sums
Find numbers whose prime factors equal a certain sum.
Judy’s Gift
How much money did Judy give Dave?
Counterfeit Coin
Find the counterfeit coin.
Counting Zeros
Determine the number of zeros at the end of a particular factorial.
Cooking an Egg
How could you cook eggs for 15 minutes if you do not have a 15-minute timer?
Factoring Days
Is today’s date a factor of this month?
Dividing Primes
Which numbers are divisible by all three of the smallest prime numbers?
Heavy Reader
How many pages did Alexis read?
Using up Digits
Can you find a multiplication sentence using the digits 1, 2, 3, 4, 5, and 6 such that the product is closest to a certain number?