Pick a question. Each one opens on the bare problem: work it on paper first, then press play to check every move.
The skills underneath the missed points. Each takes under a minute.
Ten problems built from the missed ones. The answer only shows on the last frame.
The same ten practice problems come as a printable sheet with boxed work space, plus a separate answer key with every step worked out. Both are PDF files sent with this page, so they can be printed without giving away the answers.
Suggested order before the retake: work the sheet cold, check with the key, then replay the walkthrough for anything that didn't match.