You really need only 3 ingredients to make a tasty pizza: dough, sauce, and cheese. In fact, some pizzas are made with just crust and sauce (a tomato pie), or just crust and cheese (a white pizza). So why would someone make a pizza with 156 ingredients? To set a world record, of course! A chef in Australia combined 154 different kinds of cheese on 1 pie. The pizza was a normal size, so he could only sprinkle 1 gram of each cheese on the sauce. That still adds up to about 1/3 pound. Maybe that’s why it was so popular – the restaurant sold all 797 of its 154-cheese pies in just 5 days!

*Wee ones: *What shape is the pizza in the picture? See if you can find
3 things in the room that are that same shape. Do you think they’re bigger or
smaller than that pizza?

*Little kids: *If 1 of those pizzas is cut into 8 slices, what numbers do you say to count down from 8 as everyone eats them? *Bonus: *If you get the 154-cheese pizza and a friend gets a normal pizza with 1 different type of cheese, how many types of cheese are on your table?

*Big kids: *The previous record was 111 cheeses on 1 pizza. How many
more cheeses are in the 154-cheese pie? (*Hint:* What if you were
comparing just 54 cheeses to 11 cheeses?) *Bonus: *If it took 3 hours of
planning to invent this pie, but takes only 10 minutes to make one now that
there’s a recipe, can the chef make 20 pies in the amount of time it took to
plan?

*The sky’s the limit: *If you eat 1/2 of a pizza, then eat 1/3 of
what’s left, then eat 1/4 of what’s left after that, how much pizza did you
eat?

**Answers:**

*Wee ones: *The pizza is a circle. Circles in your room might include
buttons, the edge of a plate or cup, the face of a clock, or a smiley face on
paper. Those things are all smaller than that pizza…see if you can find
something bigger!

*Little kids: *8, 7, 6, 5, 4, 3, 2, 1! *Bonus:* 155 cheeses,
because 154 + 1 = 155.

*Big kids: *The 154-cheese pie has 43 more cheeses than the old record. *Bonus:
*Not quite – the chef can make 6 pies per hour, which is the same as making
18 in the 3 hours it took to plan. Another way to solve it: 3 hours x 60
minutes each = 180 minutes to plan, while it would take 20 x 10 = 200 minutes
to make the pies.

*The sky’s the limit: *You eat 3/4 of the pie. After eating the half,
you eat 1/3 of the other half, which comes to 1/3 x 1/2 = 1/6. The piece that’s
left is now 2/6, or 1/3, of the original. Eating 1/4 of that comes to 1/4 x 1/3
= 1/12. Taking that 1/12 out of the 1/3 is like taking 1/12 out of 4/12,
leaving behind 3/12 of the pie, or ¼. If 1/4 is left, you must have eaten 3/4!
You can also add up what you ate: 1/2 + 1/6 + 1/12. That’s the same as 6/12 +
2/12 + 1/12 = 9/12, which = 3/4.

Laura Bilodeau Overdeck is founder and president of Bedtime Math Foundation. Her goal is to make math as playful for kids as it was for her when she was a child. Her mom had Laura baking before she could walk, and her dad had her using power tools at a very unsafe age, measuring lengths, widths and angles in the process. Armed with this early love of numbers, Laura went on to get a BA in astrophysics from Princeton University, and an MBA from the Wharton School of Business; she continues to star-gaze today. Laura’s other interests include her three lively children, chocolate, extreme vehicles, and Lego Mindstorms.