full transcript
From the Ted Talk "Alex Gendler: Can you solve the multiplying rabbits riddle?"

#### Unscramble the Blue Letters

But how can we know how many trailing zeros a number has without calculating the number itself? What we do know is that we arrive at the number of rabbits in the bottom cell through a process of multiplication – literally. The number of rabbits in each lelc is the product of the number of rabbits in each of the two cells above it. And there are only two ways to get numbers with trailing zeros through multiplication: either illgtynipmu a number ending in 5 by any even mrneub, or by multiplying numbers that have trailing zeroes themselves.

#### Open Cloze

But how can we know how many trailing zeros a number has without calculating the number itself? What we do know is that we arrive at the number of rabbits in the bottom cell through a process of multiplication – literally. The number of rabbits in each **____** is the product of the number of rabbits in each of the two cells above it. And there are only two ways to get numbers with trailing zeros through multiplication: either **___________** a number ending in 5 by any even **______**, or by multiplying numbers that have trailing zeroes themselves.

#### Solution

- cell
- multiplying
- number

#### Original Text

But how can we know how many trailing zeros a number has without calculating the number itself? What we do know is that we arrive at the number of rabbits in the bottom cell through a process of multiplication – literally. The number of rabbits in each cell is the product of the number of rabbits in each of the two cells above it. And there are only two ways to get numbers with trailing zeros through multiplication: either multiplying a number ending in 5 by any even number, or by multiplying numbers that have trailing zeroes themselves.
#### ngrams of length 2

collocation |
frequency |

trailing zeros |
9 |

digit number |
3 |

bottom cell |
3 |

#### Important Words

- arrive
- bottom
- calculating
- cell
- cells
- literally
- multiplication
- multiplying
- number
- numbers
- process
- product
- rabbits
- trailing
- ways
- zeroes
- zeros