Slipped

She slipped and made an error in her calculations, resulting in an incorrect answer.

The package slipped from the delivery driver's hands and tumbled down the steps.

He slipped a piece of paper into the envelope and sealed it shut.

The thief slipped the stolen goods into his backpack and walked out of the store.

The key slipped out of the lock and onto the ground.

I slipped up and forgot to send the important email.

The thief slipped away with the purse before anyone noticed.