# Double-Trouble Dominoes

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.

# Double-Trouble Dominoes

March 31, 2019

Dominoes are little toy rectangle tiles with dots on them. People like to stand them up on end in a long row, so when the first domino falls over, it knocks over the next domino, which knocks over the next…pretty soon you have a rippling wave of falling dominoes. In this simple but amazing video, Stephen Morris shows that a little domino can knock over another one that’s 1 1/2 times as big in each direction. Then that one can tip over one that ‘s 1 1/2 times as big again. In this domino chain, the first one is only 1/4 inch tall, but the 13th domino weighs more than 100 pounds! If he kept going, the 29th domino would be as tall as the Empire State Building (1,454 feet). We’d all better get out of the way!

Wee ones: The chain uses 13 dominoes. How many of them can you count starting from 1? Count as high as you can!

Little kids: If there are 13 dominoes and only the 1st has fallen, how many are left standing? Bonus: If the dominoes start falling, but you stop the wave by pulling out the 5th domino, how many dominoes are left standing?

Big kids: If each domino could tip over a domino twice as tall…how many times as tall as the 1st domino would the 5th one be? Bonus: If the first domino is 1 inch tall and they keep doubling, which domino would be the first one that’s taller than you are?