If you think of four as four dots, you can show the dots as a square. And that's how the ancient Greeks thought of four---as a shape with four sides and four corners. Four is an even number. It can...
Three
If you think of three as three dots, you can show it as a triangle. A triangle is a shape with three sides and three angles, or corners. That's how the ancient Greeks thought of three. The Greeks...
Two
Two is the first even number---a number that can be broken apart and made into two smaller numbers that are exactly the same. Break two apart and you get a one and a one. Long ago, both the Chinese...
One
One is a thing all by itself. But when you put ones together, you get other numbers. You can make every number using ones. You can't do that with any other number. The ancient Greeks were fond of...
Zero
Zero stands for nothing. If you have zero ice cream cones, then you have none at all. It may seem very silly to have a numeral for something that isn't there, but the numeral 0 is really very...
Take a number
Do you know the color of number five? Do you know the shape of a four? Do you know which number is lucky? We can tell you all that and more! For there's a lore and a magic in numbers, Or so...
Guess what you’ve been doing!
Were you able to guide Ribidip through the maze to the safety of the pond? Did you figure out how to get the wolf, the goat, and the cabbages across the river? Were you able to put the five playing...
The mysterious Mobius strip!
If you have a piece of paper, that paper will have two sides, right? If you wanted to, you could color one side red and the other side blue, couldn't you? And even if you roll the paper into a tube,...
The secret word
There was once a very large, fat, and quite handsome bullfrog by the name of Ribidip, who lived in a small pond in a forest. He was well liked by the mud turtles, was friends with most of the fish,...
A moving numbers game
You can play this game by yourself, on the floor or on a table. You need only five playing cards---an ace, 2, 3, 4, and 5. Lay the cards out just as they are shown in the picture at the top of this...