Question

There are approximately 2.2 million marriages per year in the US.  How many marriages per hour is this?

Answer 1

1 year=365 days
1 day= 24 hours, si
365 days=365×24
365 days= 8760 hours

We know that about 2200000 marriages in 8760 hours, so I have this:
2200000 marriages:8760 hours
?marriages:1 hour
This is call tree diagram
First step:
Use crops multiply, so
1×2200000=220000
Second step:
Divided
2200000÷8760≈251 marriages per hour. As a result, this is about 251 marriages per hour in the US. Hope it help!