You can’t believe everything you see, even the Double-Stuf Oreo. Oreos are the famous dark chocolate sandwich cookie with sugary crème filling. Then came the Double-Stuf Oreo, which says it has twice as much filling. Well, a math teacher named Dan Anderson and his class weighed a pile of Oreos, then scraped out and weighed all the white filling to find out the “regular” amount of filling. They did this again with Double-Stuf, and found out it was only 1.86 times as much stuffing, not 2.00. Mega-Stuf, which is supposed to have 3 times as much filling, fell short, too. We should have known — they couldn’t even bother to double the f in “stuff”!

*Wee ones:* If you eat 2 Oreos and each has 2 chocolate wafers, how many wafers do you eat?

*Little kids:* If you eat 6 Oreos, what numbers do you say to count down as you eat them? *Bonus:* How many wafers do they have?

*Big kids:* If you eat 18 Oreos at once, which would be gross, and twice as many of them are Double-Stufs as regular, how many of each kind of Oreo do you stuff down? *Bonus:* If you eat a regular Oreo first, then a Double-Stuf, then a Mega-Stuf, then a regular again to repeat the pattern, how many Double-Stufs do you eat out of 40 cookies?

*The sky’s the limit:* If you eat 75 cookies (ugh) and you eat the same number of regular Oreos as Double-Stufs, but 3 times as many Mega-Stufs as Double-Stufs, how many of each do you eat?

Answers:

*Wee ones:* 4 wafers.

*Little kids:* 6, 5, 4, 3, 2, 1. *Bonus:* 12 wafers.

*Big kids:* 12 Double-Stufs and 6 regular Oreos. *Bonus:* 13 Double-Stufs. There are 13 full triplets of cookies, and the 40th cookie is a regular Oreo, not a Double-Stuf.

*The sky’s the limit:* You eat 45 Megas, 15 Doubles and 15 regulars. Each “set” of cookies has 1 regular Oreo, 1 Double-Stuff, and 3 mega-stufs, or 5 cookies total, and there are 15 of those sets in 75 cookies.

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.