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Maths posts

Hydra heads brainteaser Brainteaser

by David, 22 April 2021 | 0 comments

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Difficulty: Tricky While out adventuring, Heracles the Hero came across a monstrous, 9-headed Hydra. Without pausing to think, Heracles pulled out his sword and started cutting off the Hydra’s heads. After several minutes of cutting, Heracles realised it was taking ages to remove the heads. Then he remembered something his friend Euripides told him.

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Half a thousand brainteaser Brainteaser

by David, 13 April 2021 | 0 comments

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Difficulty: Fun Can you add one symbol below to make half a thousand? 5 5 5 5 5

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Dust mite dilemma brainteaser Brainteaser

by David, 31 March 2021 | 0 comments

Crosshatched page with arrows and numbers in different directions.

This brainteaser comes from our new book, Puzzles and Projects. This book features some of the best puzzles, hands-on activities, stories and more from Double Helix magazine. Plus, there’s stacks of new content to explore! You can buy a copy on the CSIRO Publishing website, or pick it up from your favourite bookstore!

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Easter activities Activity

by David, 25 March 2021 | 0 comments

Hand holding a transparent egg shape orb.

Are you looking for some fun activities to fill your Easter break? Check out these seasonal suggestions!

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Giant golden cube brainteaser Brainteaser

by David, 12 March 2021 | 4 comments

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Difficulty: Tricky Sian is making a big, shiny cube in Minecraft. It will be 10 blocks wide, 10 blocks deep and 10 blocks high. The outer layer of blocks will be made of gold. Everything inside the cube will be made of obsidian. Will Sian need more gold blocks, or more obsidian ones?

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Mirror ages brainteaser Brainteaser

by David, 3 March 2021 | 3 comments

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Misrak was looking at the birthdays in her family. After a bit of maths, she realised that her father’s age and her grandfather’s age had the same digits, but swapped. When she added their ages together, she got 121. Her grandfather was aged between 20 and 40 when her father was born. Can you work…

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Star maze brainteaser Brainteaser

by David, 17 February 2021 | 0 comments

Yellow star pattern on a black background with an alien face and a blue dot.

Difficulty: Tricky Ollie the space octopus is lost! She’s trying to get back to her home planet – the blue circle – and she needs some help. Ollie’s spaceship has special engines. They cause the spaceship to fly in a straight line, but whenever they hit a yellow star, they must make a right-angle turn….

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Adding on dice brainteaser Brainteaser

by David, 21 January 2021 | 0 comments

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Difficulty: Fun How well do you know your dice? A standard dice is a cube with six sides. Each side is numbered with a different number from 1–6. Most six-sided dice also have a special trick in the way they are numbered. If you add the number on the top and the number on the…

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Hands-on science for the holiday season Activity

by David, 18 December 2020 | 0 comments

Small metal bells in a glass of fizzy water

It’s the silly season! Looking for a way to celebrate with science? Try this collection of hands-on activities.

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… and one and a half brainteaser Brainteaser

by David, 7 December 2020 | 0 comments

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Difficulty: Extreme I’m thinking of a number. When you add one and a half to it, you get the same result as if you multiplied it by one and a half. What’s the number I’m thinking of?

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