How do you report hours that vary week to week? - what worked for you?

I work some days through a staffing agency while still certifying. There are 3 people counting on me, so I am trying to be careful. The form asks for gross earnings, which I do not see until later. Who can I ask without risking my claim?

In my state the question was about the week I worked, not the week I was paid. Read the wording on your form carefully, or ask the claims line.

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