How do you report hours that vary week to week? (update)

I picked up part-time shifts as an operations analyst and I am confused about how to report them. There are 16 people counting on me, so I am trying to be careful. Sometimes my paycheck is late by a week.

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.