## Fast folding brainteaser

By David Shaw, 29 April 2020

**Difficulty: Fun**

Aoi is a very consistent origami artist. It takes her two minutes and 23 seconds to fold one crane. Without using a calculator, or even a pen and paper, can you work out how long it will take her to fold 60 cranes?

**Scroll down or click for a hint, or the answer!**

## Brainteaser hint

There’s a special trick that makes this easy. You shouldn’t need to multiply anything!

## Brainteaser answer

It will take 60 times longer to fold 60 cranes instead of one. 60 times one minute is one hour. 60 times one second is one minute.

That means 60 times two minutes and 23 seconds is two hours and 23 minutes!

*For more brainteasers and puzzles for kids, subscribe to Double Helix magazine!*

## 0 comments