Besides producing delicious lemon bars, this recipe for Classic Lemon Bars from the Food Network is also a great opportunity to think about geometry and numbers. The recipe makes 24 bars, and we’re supposed to bake the whole thing in a 9 by 13 inch pan….

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# Category: Math in Every Day Life

## Math and Economics at the Farmers Market

There’s still nothing like experiencing math in the context of of simple cash purchases. I say “still” because of the plethora of available extra-curricular math resources like competitions, online programs, manipulatives, etc. In our age dominated by credit card and online purchases, many kids don’t have the opportunity to develop the skills of making simple arithmetic computations in real time while talking to people….

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## Three sisters and their PJ’s

When I saw Grace, Sophie, and Chloe in their mismatched pajamas, a question immediately popped up: if there are 3 sisters, and 3 pairs of pajamas, how many ways are there for them to wear the pajamas so that the top and bottom are mismatched? The 3 pajamas will be referred to by…

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## A prism of a bathroom sink

A trip to the ladies room of the Arclight Cinemas in the local mall revealed a somewhat unusually shaped sink. In case you’re wondering where the water drains, there’s a slit right along the back edge, shown by the blue arrow. But what happens if the drain backs up; how much water can a sink…

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