On May 15 we celebrate the melty, tasty chocolate chip. So who invented it? In the 1930s, tried mixing pieces of chocolate bar into cookie dough, hoping they’d melt and mix in. Instead, the pieces stayed in separate gooey blobs. So now we have the chocolate chip cookie! We also stir chips into cakes, ice creams, and pies. No matter how you do the math, the answer is “Yum.”

*Wee ones:* Which has a smaller number of chocolate chips, a cookie with 4 chips or a cookie with 6 chips?

*Little kids: *If a cookie has 10 chocolate chips, what numbers are the 3 chips you eat after chip #5? Bonus: How do you count the chips you eat in your first 5 cookies, if you count by 10s?

*Big kids:* You can mix melted chocolate chips with whipped egg white and whipped cream to make chocolate mousse! If the recipe needs 120 chips and you have 2 bags of 70 chips each, do you have enough chips? *Bonus:* If instead you make chocolate chip cookies, and you need 15 chips in each, how many “good” cookies can you make?

*The sky’s the limit:* If you can use 10 chips per cookie or 15 chips per chocolate mousse, how would you divide 100 chips to make exactly 8 desserts with no leftover chips?

Answers:

*Wee ones:* The cookie with 4 chips has fewer.

*Little kids: *Chips #6, 7, 8. *Bonus:* 10, 20, 30, 40, 50.

*Big kids:* Yes, because you have 140 chips. *Bonus:* 9 cookies, since 10 cookies would use 150 chips, and you have only 140.

*The sky’s the limit:* 4 mousses and 4 cookies. You need an even number of mousses to use a multiple of 10 in them. Working your way up through the even numbers, 2 mousses use only 30 chips, which leaves you with 70 to make 7 cookies. But 4 mousses use 60 chips, which leaves you with 40 to make 4 cookies.