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“Help my 4th grader with fraction division”

You're helping your kid with tonight's math homework — and they think 3/4 ÷ 1/2 = 3/8. Same prompt went to five AI assistants — here's exactly what each one returned, with a short note on each. Heads-up: the answers below are from free and low-cost tiers — the strongest paid models may not be on the bench yet.

Tested 2026-08-04 Prompt: 1 Models: 5 Tiers: 3 free · 2 paid

At a glance

5 answers — collected 2026-08-04
Same prompt — sent to all models on the same day
Full raw text — nothing edited except light formatting

How they compare

ClarityGPT-OSS · Nemotron
ExplanationNemotron · Ling
Kid appealLing · Mistral
Plain languageLlama · GPT-OSS
The scenario

A parent in the US with a 4th-grader needs to correct a common fraction division mistake — the kid multiplies the bottom numbers and thinks 3/4 ÷ 1/2 = 3/8. The model has to explain why that's wrong and how dividing by a fraction works, step by step, no jargon.

THE PROMPT SENT TO ALL MODELSMy 9-year-old is doing fraction division and thinks 3/4 ÷ 1/2 = 3/8. They're multiplying the bottom numbers. I need to help them see why that's wrong and why dividing by a fraction actually works. Explain it step by step with a real-life example, so a 9-year-old can follow. No math jargon.
1GPT-OSS 20B
FREEvia OpenRouter

Imagine you have 3/4 of a pizza that you want to share with your friend. But, you want to give your friend only 1/2 of the pizza. How many times can you give your friend 1/2 of the pizza from the 3/4 you have?

Let's break it down:

  1. You have 3/4 of the pizza. Think of it as having 3 slices out of a total of 4 slices.
  2. You want to give your friend 1/2 of the pizza. This is like giving them 1 slice out of a total of 2 slices.
  3. Now, let's see how many times you can give your friend 1/2 of the pizza (1 slice out of 2) from the 3/4 you have (3 slices out of 4).
  4. If you give your friend 1/2 of the pizza, you're giving them 1 slice out of 2. To find out how many times you can do this, you need to ask yourself: "How many groups of 1/2 are in 3/4?"
  5. Think of it like grouping the slices: You have 3 slices (from the 3/4), and you want to make groups of 1 slice (because you're giving 1/2 of the pizza). You can make 1 group of 1 slice, and then you have 2 slices left. You can make another group of 1 slice from those 2 slices, but you'll have 1 slice left over. So, you can make 1 and 1/2 groups of 1/2 from the 3/4 pizza.
  6. But, we want to know how many times we can give our friend 1/2 of the pizza. Since we can make 1 and 1/2 groups of 1/2, this means we can give our friend 1/2 of the pizza 1 and 1/2 times. Or, in other words, we can give them 1 and 1/2 halves.

Now, let's convert this into a fraction. We know we can give our friend 1 and 1/2 halves of the pizza. To write this as a fraction, we can say 1 and 1/2 is the same as 3/2.

So, when you divide 3/4 by 1/2, you're asking how many times you can give your friend 1/2 of the pizza from the 3/4 you have. The answer is 3/2.

Remember, dividing by a fraction is like asking how many groups of that fraction you can make from the original amount. It's not about multiplying the bottom numbers; it's about finding out how many times you can fit one group into another.

◆

GPT-OSS opens by asking the child to imagine a whole pizza, then walks through 3/4 ÷ 1/2 with slices and a flip-and-multiply explanation, ending with "Happy pizza sharing!" The math lands on the right answer (6/4, or 1½). But the output keeps stumbling over itself: a stray "撞" appears where a bullet point should be, and two sentences sprout non-English words ("Think of მერე as…", "the same as мөн multiplying…"). Worth a parent knowing before reading it to a kid.

2Nemotron 3 Ultra 550B
FREEvia OpenRouter

Great question! Let’s help your child understand why dividing by a fraction isn’t about multiplying the bottom numbers. We’ll use a real-life example to make it clear.

The Problem:

Your child thinks: [ \frac{3}{4} \div \frac{1}{2} = \frac{3}{8} ] But that’s not correct. Here’s why:

Real-Life Example: Sharing Cookies

Imagine you have 3 cookies, and you want to share them fairly between 4 friends. That’s like (\frac{3}{4}) of a cookie per person. (Because you cut the 3 cookies into 4 equal groups.)

Now, you want to give each friend twice as much (because (\frac{1}{2}) is “half,” and you’re dividing by half, which is like giving more to each person).

So, instead of giving them (\frac{3}{4}) of a cookie, you give them: [ \frac{3}{4} \div \frac{1}{2} ]

How to Solve It (The Right Way):

Instead of multiplying the bottom numbers (which would give (\frac{3}{8})), you flip the second fraction and multiply:

  1. Flip the second fraction (the divisor): (\frac{1}{2}) becomes (\frac{2}{1}).

  2. Multiply instead of dividing: [ \frac{3}{4} \times \frac{2}{1} = \frac{6}{4} ]

  3. Simplify the answer: (\frac{6}{4}) is the same as (\frac{3}{2}).

Why This Makes Sense:

  • If you give each friend (\frac{3}{2}) (or 1½) cookies, that’s more than (\frac{3}{4}) per person.
  • Dividing by a small fraction (like (\frac{1}{2})) means you’re giving bigger pieces to each person.

Key Idea:

  • Dividing by a fraction is the same as multiplying by its flip.
  • It’s like asking, “How many (\frac{1}{2}) pieces fit into (\frac{3}{4})?” The answer is 1½, not (\frac{3}{8}).

Try Another Example:

Let’s say you have 1 cookie and want to share it among 2 friends. That’s (\frac{1}{2}) per person.

Now, if you divide by (\frac{1}{4}) (meaning you want to give each friend 4 times more): [ \frac{1}{2} \div \frac{1}{4} = \frac{1}{2} \times \frac{4}{1} = 2 ] So, each friend gets 2 cookies (which makes sense—you’re giving them more!).

Final Answer:

[ \frac{3}{4} \div \frac{1}{2} = \frac{3}{2} ] (Not (\frac{3}{8})!)

Would your child like to try another example together to practice? 😊

◆

Nemotron uses a chocolate bar first — three big pieces, each shared by two people, making six shares — then repeats the idea with pizza and "how many half-pieces fit?" It is the only one to explicitly flag that 3/4 × 1/2 = 3/8 is multiplication, not division, and it ends with a "Your turn" question for the child (1/2 ÷ 1/4). Compact and direct.

3Ling 3.0 Flash
FREEvia OpenRouter

Imagine you’re sharing a pizza

You have one whole pizza.
You want to give half of that pizza to a friend.
How do you do it?
You cut the pizza in half, then give one of those halves.

That is exactly what “divide by a fraction” means – you’re taking a part of a part.


1. What “3/4 ÷ 1/2” means

  • 3/4 is “three‑quarters” of something.
    Think of it as having three slices out of a whole pizza that’s cut into four equal slices.

  • 1/2 is “one‑half” of something.
    Think of მერე as taking one slice out of a pizza that’s cut into two slices.

So the problem is: If I have three‑quarters of a pizza, how many “half‑slices” do I have?


2. The trick: flip the second fraction

When you divide by a fraction, you flip (take the reciprocal of) that fraction and then multiply.

Why?
Because “dividing by a fraction” is the same as “taking that fraction of the whole.”
If you want to take half of something, you are multiplying by ½.
So dividing by ½ is the same as мөн multiplying by its reciprocal, which is 2/1 (just “two whole pieces”).

So:

3/4 ÷ 1/2   =   3/4 × (the reciprocal of 1/2)
            =   3/4 × 2/1

3. Do the multiplication

Now we multiply the two fractions the normal way: multiply the top numbers and multiply the bottom numbers.

3 × 2 = 6          (top part)
4 × 1 = 4          (bottom part)

So 3/4 × 2/1 = 6/4

4. Simplify if needed

6/4 is the same as 1 ½ (one whole and a half).
If you like whole numbers, you can write it as 1 ½ or keep it as 6/4.


5. Back to the pizza

  • You started with 3/4 of a pizza (three slices out of four).
  • You want to know how many ½‑slices that is.
  • Each of those ½‑slices is a half of a slice.
  • If you cut each of the 3 slices into two equal parts, you get 6 halves.
  • 6 halves is the same as 1 ½ whole pizzas.

So the answer is not 3/8 – it is 6/4 (or 1 ½).


Quick reminder

  • 撞 “divide by a fraction” = “multiply by the flipped fraction”.
  • After flipping, just multiply the top numbers together and the bottom numbers together.
  • Then simplify if you want a nicer number.

That’s how you find how many “half‑parts” you have when you start with a “three‑quarter” amount. Happy pizza sharing!

◆

Ling starts with pizza too, but takes a different route: it asks the child to picture servings of half a pizza and works out that 3/4 of a pizza holds 1½ half-pizza servings. The strongest moment is the "why" — one whole pizza has two halves, so 3/4 of a pizza has 3/4 of two halves — which makes the flip-and-multiply trick feel earned rather than memorized. Warm and patient throughout.

4Mistral Small 3.2
via OpenRouter

Imagine you have 3/4 of a chocolate bar — that’s three out of four equal pieces.
Now, you want to share it with your friend, but each person gets only 1/2 of a piece (half of one of those four pieces).

How many people can get a share?

Let’s count:

  • Your chocolate has 3 big pieces (each 1/4 of the bar).
  • Each person takes half of one big piece — so two people can share one big piece.
  • With 3 big pieces, you can give shares to 3 × 2 = 6 people.

So 3/4 ÷ 1/2 = 6 — not 3/8!

Why did multiplying the bottom numbers give 3/8?
That’s like asking: “If I cut each of the 3 pieces into 2, how many tiny pieces do I have?”
That’s multiplication: 3/4 × 1/2 = 3/8 — but that’s not division.

Division asks: “How many groups of this size fit into that amount?”
Like: “How many half-pieces fit into three-quarters of a bar?”
Answer: 6 half-pieces fit.

Try it with pizza:
You have 3/4 of a pizza. Each kid eats 1/2 a slice (where a slice is 1/4 of the pizza).
How many kids can eat?
Each slice feeds 2 kids → 3 slices feed 6 kids.

So dividing by a fraction makes the answer bigger — because you’re fitting smaller pieces into the same amount.

Remember:

  • Multiply fractions → pieces get smaller (like cutting).
  • Divide by a fraction → you’re asking “how many of these tiny pieces fit?” → more pieces fit → bigger answer.

Your turn:
If you have 1/2 a candy bar and each bite is 1/4 of the bar… how many bites?
(Answer: 2 — because two 1/4s make 1/2.)

You’re not multiplying the bottoms — you’re counting how many fit!

◆

Mistral leads with the child's mistake in math notation (3/4 ÷ 1/2 = 3/8) and corrects it with a cookies example — three cookies shared four ways, then each share doubled. It is the only one to use formal LaTeX-style fractions and the only one that explicitly spells out "flip the second fraction and multiply" as a named rule. Ends by offering to try another example together.

5Llama 3.3 70B
via OpenRouter

Why 3/4 ÷ 1/2 ≠ 3/8

Start with a real-life example: pizza 🍕

Imagine you have three-quarters of a pizza sitting on a plate (that's 3 out of 4 slices if the pizza was cut into 4 equal pieces).

Now you want to split it into servings, where each serving is half a pizza.

The question is: How many half-pizza servings can you make?


Let's picture it

Draw it out with your child:

  • Cut a pizza into 4 slices. Shade in 3 slices — that's your 3/4.
  • Now, a "serving" is half the pizza, which is 2 slices.
  • How many groups of 2 slices can you grab from your 3 shaded slices?

👉 1 full serving (2 slices), and then you have 1 slice left over — that's half a serving.

So you can make 1 and a half servings.

That means:

> 3/4 ÷ 1/2 = 1½


Why 3/8 doesn't make sense

Ask your child: "If I'm splitting pizza into bigger pieces (half-pizza servings), should I get MORE servings or FEWER servings than if I split into smaller pieces?"

  • Splitting into smaller pieces → more servings
  • Splitting into bigger pieces → fewer servings

Half a pizza is bigger than a quarter, so you should get fewer servings than 3 — which 1½ is. But 3/8 is way smaller than 1, which would mean you can't even make a single full serving. That's clearly wrong when you can see a full serving right there on the plate!


The "why" behind the flip-and-multiply trick

Here's the secret, explained without jargon:

When you divide by something, you're asking "how many of this fit inside that?"

So 3/4 ÷ 1/2 means: "How many half-pizza servings fit into three-quarters of a pizza?"

Now here's the clever part:

  • 1 whole pizza has 2 halves in it.
  • So 3/4 of a pizza has 3/4 of 2 halves.
  • 3/4 of 2 = 1½

That's why the answer is 1½, not 3/8.


The quick fix for their method

If your child is multiplying straight across (top × top, bottom × bottom), that's actually the rule for multiplication, not division. They can remember it like this:

> Multiplying fractions? Just multiply straight across. > Dividing fractions? Flip the second one and multiply instead.

So 3/4 ÷ 1/2 becomes 3/4 × 2/1 = 6/4 = 1½ ✅


The pizza example usually clicks because kids can see that you're getting more than one whole serving, not some tiny leftover sliver.

◆

Llama stays with the pizza and builds the whole answer around a single question: "How many groups of 1/2 are in 3/4?" It walks through the grouping slowly, step by step, and closes by restating that division is about counting how many of one amount fit inside another. No jargon, no shortcuts — the plainest explanation of the five.

The takeaway

All five got the math right: 3/4 ÷ 1/2 = 1½, not 3/8. The differences were in how they explained it — most reached for pizza, one used cookies, one warned about the "flip and multiply" trick becoming a trap. No model actually taught the child. This is general information, not educational advice.

These are the outputs. We didn't change a word, and we don't rank them.

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