HomeschoolBad AI vs. Teacher-Fixed: A Fractions Lesson, Repaired
Welcome to a new series. In Bad AI vs. Teacher-Fixed, we take real AI output — the kind a homeschool parent gets on an ordinary Tuesday — mark it up the way a teacher would with a red pen, and rebuild it into something that actually works at a kitchen table.
AI lesson plans look impressive. They are formatted beautifully, they sound confident, and they are wrong in predictable ways. Here is the pattern, using the most-requested topic in elementary homeschooling: fractions.
The prompt we gave the AI
That's a reasonable prompt — most parents write something like it. Here is the kind of plan that comes back.
What the AI gave us
- Objective: "Students will add fractions with unlike denominators and simplify to lowest terms."
- Vocabulary: numerator, denominator, common denominator, equivalent, simplify — all five, introduced at once.
- Lesson (45 minutes): explain the rule for finding a common denominator, work three examples on paper, then assign practice.
- "Hands-on activity": watch a 12-minute video about fractions.
- Practice: 20 problems, including 5/6 + 3/4 and 7/8 − 2/3.
- Answer key, problem 3: 1/2 + 1/4 = 2/6.
- Assessment: a 10-question quiz at the end.
The teacher's markup: 5 fixes
Fix 1 — Wrong skill order. The child knows halves and quarters from cooking. The AI jumped straight to adding unlike denominators — a skill that sits on top of equivalent fractions, which she hasn't learned yet. When the foundation is missing, kids don't struggle with fractions; they drown in them. Sequence is a teacher's whole job here.
Fix 2 — Five vocabulary words is four too many. A 9-year-old meeting "common denominator, equivalent, simplify" in one sitting will retain none of them. One or two terms per lesson, attached to something she can touch.
Fix 3 — Watching is not hands-on. AI calls videos "interactive" constantly. For fractions at this age, hands-on means folding paper, cutting an apple, pouring water between measuring cups — real objects she can compare.
Fix 4 — The answer key is wrong. 1/2 + 1/4 is 3/4, not 2/6. The AI made the single most classic fractions error — adding straight across — in its own answer key. If a parent teaches from that key, the child learns the mistake confidently. This is why the check below exists.
Fix 5 — 45 minutes of explanation, zero checking along the way. One quiz at the end tells you she was lost 30 minutes ago. Real teaching checks every few minutes with one small question, so you can stop and repair on the spot.
The fixed lesson
- Start where she is (5 min): fold a paper strip into halves, then quarters. "Show me 1/2. Now show me two quarters. What do you notice?" She discovers 1/2 = 2/4 herself — that's equivalent fractions, the missing foundation, learned by hand.
- One new idea (5 min): same strip, thirds. "Which is bigger, 1/2 or 1/3? Prove it with the paper." One term only: equivalent.
- Cooking check (5 min): with measuring cups — "The recipe needs 3/4 cup. Show me two ways to measure it." (1/2 + 1/4, or three 1/4 scoops.) Adding fractions just happened, in her hands, before any symbols.
- Symbols last (5 min): now write what she already did: 1/2 + 1/4 = 3/4. The notation records her thinking instead of replacing it.
- Practice (5 min): six problems, not twenty — two with strips, two drawn, two symbolic. Stop while it's still going well.
- Exit question: "Convince me: is 1/3 bigger than 1/4? Use the strip." Her answer tells you exactly what tomorrow needs.
Notice what changed: less content, in the right order, objects before symbols, and a check every few minutes. The AI supplied raw material in ten seconds — genuinely useful. The teacher supplied the judgment. That division of labor is the whole idea of this site.
The 2-Minute Teacher Check (use it on any AI lesson)
- Level: Is this my child's actual level — or the level the AI assumed?
- Order: Does each step only use skills my child already has?
- Hands: Is the "hands-on" part something my child touches — or just watches?
- Answers: Did I personally verify the answer key? (Work problem 1 and the hardest one.)
- Time: Is the timing honest for my child's age and attention today?
Want the prompts behind lessons like this — each with its own Teacher-Checked note? They're all in the Prompt Library.
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