On March 14 (3/14) we celebrate Pi! When you multiply the width of a circle by pi (3.14159265…), you get the distance around the edge. So we’re celebrating some of our favorite circle-shaped foods, like oranges, lemons and limes. If you slice across any citrus fruit, you’ll see a circle divided into little pie sections called “liths.” The number can differ, but photos show that most lemons have 8 or 9 liths; oranges and limes have 10 to 12; and grapefruit can have 14 or more. And you can figure out the number before cutting the fruit — read on to learn the secret!

*Wee ones:* Can you count the pie sections of the lemon slice in the middle of the picture? How many do you count?

*Little kids:* Which has more sections, a 10-lith lime or an 8-lith lemon? *Bonus: *If your orange has 12 cute little sections, and 4 of them have seeds you have to spit out, how many don’t?

*Big kids:* SECRET: If you pull that bellybutton thing off a citrus fruit and count the little white dots under it, it tells how many sections the fruit has! If each of your 2 grapefruits have 14 dots, how many liths do they have together? *Bonus:* If your pile of 9-segment lemons and 14-segment grapefruit has 51 sections in total, how many of each fruit must you have?

Answers:

*Wee ones:* We count 8 pie sections.

*Little kids:* The lime. *Bonus:* 8 seed-free sections.

*Big kids:* 28 liths. *Bonus:* 3 grapefruit and 1 lemon. If you keep subtracting 9 from 51, the only result that is divisible by 14 is 42 (51 minus 9).