I am sitting with my 8th grader tonight
Ask
I am sitting with my 8th grader tonight reviewing her pre-algebra / algebra 1 worksheet in Denver, Colorado (America/Denver).
She missed 6 problems on the page, but when we look closely, all 6 mistakes stem from just two recurring sign bugs:
1. Negative distribution bug: For -3(2x - 5), she wrote -6x - 15 (multiplied -3 by 2x correctly, but dropped the negative on -3 * -5). She did the exact same thing on -2(4x - 7) = -8x - 14.
2. Subtracting terms with negative variables: For 4 - 2x = 10, she subtracted 4 and wrote 2x = 6 (dropped the negative sign attached to 2x).
Can you cluster these into two 5-line cause cards (prompt, wrong, right/fix, tag, cause) in our personal mistake notebook, and schedule our daily 19:00 review reminder so we review them on their due dates?
Answer
I'll get the notebook's current state, the scripts, and today's date in Denver.
Today in Denver is 2026-09-16. Let me check the script schema and current state of the notebook.
Let me check duplicate detection logic before appending.
Both new cards use distinct prompts/wrongs, so they won't collide with existing ones. Appending both in one batch.
Both cards are in. Now the daily 19:00 reminder, anchored to Denver time.
Two cards went in, both due tomorrow (Sep 17, Denver). And a heads-up about what's already in the notebook.
**Card 1 — `distribute-negative`** (id `d468c36ecf65690a`)
- Prompt: `-3(2x - 5)`
- Wrong: `-6x - 15`
- Fix: `-6x + 15` — both inner terms flip sign when the outside coefficient is negative
- Same-type to drill: `-2(4x - 7) = -8x + 14`
**Card 2 — `drop-negative-term`** (id `d5d2d148eaeddf77`)
- Prompt: `4 - 2x = 10`
- Wrong: `2x = 6`
- Fix: `-2x = 6, x = -3` — keep the negative that was already on the term
- Same-type to drill: `7 - 5x = 22` → `-5x = 15` → `x = -3`
**Daily 19:00 reminder is set** in `America/Denver`. The system nudges the actual trigger by a few minutes for load-balancing, so the first one fires tonight at **19:06:32 MDT**. When it goes off, it pulls up whatever cards are due that day and has her self-test before showing the fix — on a day with nothing due, it just says so instead of drilling a blank page. Say "stop that reminder" any time and I'll cancel it.
**One thing to know:** the notebook already had two cards from earlier work that are due **tonight** — `1/3 + 1/4` (fractions) and `400 − 167` (borrowing). They're separate from tonight's worksheet, but the 19:00 reminder will include them along with the two new ones starting tomorrow.