2 Answered Questions for the topic math competition prep
Math Competition Prep Number Theory
Find the least natural number such that the number is divisible by 75 and all its digits are 1 or 0 only.
Is there any trick to be able to do this fast?
How do I solve this problem regarding divisibility from my Math Challenge class?
What remainder does the number 123456789 leave after division by 8? Is there a trick to solving this?