2 Answered Questions for the topic math competition prep

Math Competition Prep Number Theory

07/06/19

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

07/05/19

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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