Here's your nightly math! Just 5 quick minutes of number fun for kids and parents at home. Read a cool fun fact, followed by math riddles at different levels so everyone can jump in. Your kids will love you for it.

April 29, 2018

Have you ever wondered how many people you know? It’s probably more than you think. You have your family, and all your relatives: grandparents, aunts, uncles, cousins. Then you have your friends and neighbors. That number keeps getting bigger, too: every time you start a new school year, sports team, or art club, you meet new people. Scientists at Columbia University have guessed that American grown-ups each know and remember around 600 people at any time! And of course, if each of them knows 600 people, and each of thosepeople knows 600 people…that’s a lot of friends you could meet.

Wee ones: How many people live in your home, including you?

Little kids: If you go out for ice cream with 9 friends, how many of you are there in total?  Bonus: If each of your friends (but not you) also brings along 1 friend, now how many people go out for ice cream?

Big kids: If you’re counting the 600 people you know, and you’ve counted all but the last one, how many have you counted?  Bonus: If you know 30 people and each of them knows 30 others, how many people come to your party if you invite them all? (Hint if needed: What’s 3 times 30, and then what does 30 x 30 have to be? And don’t forget your own 30 friends…)