Frank has baseball practice every 4th day and choir practice every 6th day. When will he have baseball and choir practice on the same day?

Answer 1

This is just a Lowest Common Multiple (LCM) question.
So the first time would be 12 days, then 24, 36, etc days from your day of reference.

look at it this way:
days for baseball: 4, 8, 12, 16, 20, 24, 28, 32, 36, ..
days for choir: 6,12, 18, 24, 30, 36, ...

Which days are common?

Answer 2

36