If Joe works eight hours per week at $10.75 an hour, how much will he make in one month?

Multiply his hourly rate by the number of hours per week:

$10.75 x 8 hours = $86.00 per week.

An average month has 4 weeks, so in a 4 week month, multiply his weekly pay by the number of weeks in a month. (Some months have 5 weeks, so you would need to multiply the weekly amount by 5 weeks).

$86 x 4 weeks = $344