# Blog

## Curved origami sculpture

By David Shaw, 7 September 2022

Folding origami cranes and paper aeroplanes is fun, but they tend to be made of straight lines. So what happens when you fold in curves?

## Straight curves

By David Shaw, 31 August 2022

Skewers are straight and pretty tough. But put just the right twist on them, and you can make something surprisingly curvy!

## When clock hands meet brainteaser

By David Shaw, 24 August 2022

For an entire day, Ruth watched a dial clock, looking for when the hands met. She wrote down all the times they met. Which hour did the hands not meet?

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## Your number is up! A quick quiz

By David Shaw, 12 August 2022

This quiz is for all you maths wizards. Can you maximise your score, or does this quiz have your number?

## Sneaker discount brainteaser

By David Shaw, 11 August 2022

Billie is really in to sneakers and is aiming to sell them for a profit. Work out if Billie made money, lost money, or sold the sneakers at their original price.

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## Two candles brainteaser

By David Shaw, 27 July 2022

Barry has 2 candles that are both 60 centimetres long. One will last for 1 hour, and the other will last for 2 hours. Barry lights both candles at the same time. Later, he blows them out at the same time. The next day, Barry realises that one of the candles is half the length of the other. Assuming they both burnt evenly, how long were they burning for?

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## A maths prize for packing balls

By David Shaw, 21 July 2022

Have you ever struggled to pack balls back into your toy box? The Fields Medal, one of the most famous prizes in mathematics, was recently announced. One of this year’s winners, Ukrainian mathematician Maryna Viazovska, is an expert in packing balls in boxes. But there’s a catch! Her findings work in 8 dimensions (D) and beyond.

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## Try a tangram

By David Shaw, 20 July 2022

This traditional Chinese puzzle, known as a tangram, reveals some surprising properties of squares!

## Five makes 80 brainteaser

By David Shaw, 13 July 2022

Can you find 5 consecutive (counting upwards) numbers that add up to 80?

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## Two trains brainteaser

By David Shaw, 29 June 2022

Difficulty: Fun A fast passenger train leaves Sydney Central station, headed for Broken Hill. At the same time, a slow freight train, moving at only half the speed of the passenger train, leaves Broken Hill station, headed for Sydney Central. When they meet, which train is closer to Sydney?

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