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?
Math Competition Prep Math Number Theory Divisibility


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?

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