5 minute lesson
a very hungry maths lesson

What even is a fraction?

It’s pizza o’clock. Two of you, one pizza, and everybody wants the big slice. A fraction is simply the maths that keeps the sharing fair — and it fits in the space between your teeth.

5 minutes0 worksheets1 whole pizzaages 9+
click the pizza to cut it
1

This is one whole pizza. Nothing cut yet. Every fraction starts from this 1.

cuts so far 0
?

The question we’re here to smash

You may have ½ of this pizza or ¼ of the same pizza. Which one gives you more to eat? Stick around — by the end you’ll answer without even thinking.

Step 1 · the cut

One pizza = one whole

Before any fractions, everybody agrees on one thing: the un-cut pizza is the number 1. Every fraction is just a name for a piece of it.

Drag the slider. Watch what each single slice gets called.

14

Each slice is called a quarter — one piece out of four equal pieces.

Step 2 · the name

Upstairs and downstairs

A fraction is two numbers with a line between them, and each one has a job. Click the slices on the pizza to put them on your plate.

38
upstairsNUMERATOR — how many slices you actually took.
downstairsDENOMINATOR — how many equal slices the pizza was cut into.

So 3/8 is read out loud as “three eighths” — three pieces, out of eight equal pieces.

Secret boss level

Take all the slices and see what happens…

3

Click a slice to take it (or give it back).

Step 3 · the big question

So… is ½ bigger than ¼?

Two same-size pizzas. Take one slice from each. The seesaw doesn’t lie — and neither does the bar underneath.

try:
Plate A
12 tap slices too!
Plate B
½
¼
Half is bigger than a quarter. A half is the same as two quarters — so one slice of a 2-cut pizza beats one slice of a 4-cut pizza.
The rule that tricks everybody
The downstairs number is the boss.
More slices → each slice gets smaller.

Sharing with 2 friends means big slices. Sharing with 8 friends means tiny slices — even though 8 is a bigger number! That’s why ½ beats ¼. Bigger downstairs number, smaller piece of pizza.

Say it out loud

“One half is bigger than one quarter.”
“One quarter is smaller than one half.”
“Two quarters make one half.”

Saying it is how it sticks. Try it right now — out loud. Yes, really.

Step 4 · proof

The slice-size ladder

Every bar below is one single slice from a same-size pizza. Watch what happens as the downstairs number climbs.

…they just keep getting smaller ↓

Step 5 · showtime

Pizza showdown

Six rounds. Pick the plate with more pizza. Round 6 is sneaky — read the pizzas carefully.

round 1/6 score 0 streak 0 🔥
Choose a plate.
Pick the one with more pizza on it.
You’re starving. Which plate gives you more pizza?
Cheat sheet

Everything, on one board

The golden rule
Downstairs tells you the size of one slice. Upstairs just counts how many you grabbed.

Equal slices only. Same-size pizzas only. And ½ will always beat ¼ of the same pizza — no arguments at the table.

Your mission tonight

Next time we order a pizza, ask for “three eighths, please” — then prove out loud why ¼ is smaller than ½ using the actual box. Teachers call this “maths in real life”. You call it dinner.